Microsoft windows operating system ошибка

The «missing operating system» or «operating system not found» error message usually appears on a black window when you start Windows computers. It would prevent you from booting Windows. This error is very common for Dell, Acer, Lenovo, HP, and Sony desktops and laptops. You can read on to get error details or skip directly to solutions.

🔥Read Also: How to Fix Total Identified Windows Installations 0

Generally, when something goes wrong with the BIOS configuration, hard drive health, or the Master Boot Record (MBR), you can’t boot the Windows and will see the mentioned two error messages. To be specific, the causes that lead to Operating System Not Found are as follows.

• The basic input/output system (BIOS) does not detect the hard disk
• The hard disk drive is damaged
• Improper/incorrect BIOS settings
• Windows Master Boot Record (MBR) is corrupt/damaged
• An incompatible partition is set as active

Note: If the BIOS fails to detect the operating system, you will receive one of the following error messages, which tells the same problem on different operating system versions.

Error message 1: Missing Operating System

Error message 2: Operating system not found

So how could you get rid of this error, making computer detect the operating system and boot up successfully again? Here is what’s we intent to help in the next part. Continue reading and you’ll get fixes to fix operating system not found error instantly.

7 Solutions to Fix Mising Operating System or Operating System Not Found Error

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After knowing the causes for an operating system not found or missing in Windows, now it’s time to apply effective solutions to restore the missing operating system. Don’t forget to share this article to let others know about the causes behind this issue.

Solution 1. Check If the Hard Drive Is Detected by BIOS

When non system disk or disk error occurs on the computer, BIOS settings won’t be able to detect and load the operating system, then your computer won’t be able to boot up. In case of this, you may first check the BIOS settings and see if the OS hard drive is set as the Boot drive. Here are the detailed steps you can follow:

Step 1: Press and hold «F12/F10″ while pressing the «Power» button to turn on the PC.

Step 2: Release F12/F10 when the BIOS Setup Utility is displayed.

Step 3: Try to find IDE Primary Master, IDE Primary Slave, IDE Secondary Master, and check whether they can be detected or not.

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For more fixes, you can refer to this page to fix hard disk not detected in bios error with success. 

If no disk is shown or displayed as None/Not Detected, it means that the BIOS doesn’t detect the drive and you may select None to Auto. This may solve the Operating System not found error.

If the system disk information is displayed, it means that BIOS can detect the hard drive and you need exit BIOS.

Solution 2. Test Hard Drive Problems

The next move is to detect if the OS hard drive contains any problems or errors in BIOS settings. Follow the steps here and learn how to do so on your own:

Step 1: Press and hold «F10» and press the «Power» button to turn on the PC > Release F10 after the PC screen display you with a test.

Step 2: Use the right arrow to select the «Tools» menu in the BIOS Setup Utility.

Step 3: Then select «Hard Drive Self Test» > Press «Enter» to start the test.

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After the test, you’ll get two results:

#1. All Tests Passed

This means the hard drive is not damaged. You may jump to Solution 3 to reset BIOS to the default state so as to getting rid of missing operating system issue.

#2. The Test Failed

You should contact your hard disk or computer manufacturer for a replacement as long as these devices are under warranty.

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Solution 3. Set BIOS to default settings

Improper settings or incorrect BIOS settings may also cause the issue ‘operating system not found’ in your PC. You can try to set BIOS to default settings to solve the problem.

Step 1: Restart PC and enter BIOS.

Step 2: Find BIOS and enable the default setup option, including Load Optimal Defaults, Get Default Values, Load Optimized Defaults, Load Setup Defaults, and so on.

Step 3: Press «F10» to save changes and quit from BIOS.

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If this method doesn’t work, the MBR disk could be damaged and you may jump to Solution 4 to fix MBR Windows10 or newer operating system with preofssional MBR repair method.

Further Reading: Windows 11 Black Screen with Cursor

Solution 4. Repair MBR with the Installation CD/DVD

Both wrong operation and virus infection can damage MBR, which locates in the first sector — usually sector 0 of the hard disk. Thus, Windows will not boot. You can try to repair MBR using the Windows installation disk in Command Prompt.

Insert Windows Operating System Disc to the optical (CD/DVD) drive

Step 1: Press the «Power» button to turn on the PC > Hit «Enter» when Boot from CD prompt.

Step 2: Press «R» key in Windows Setup Menu to start the Recovery Console.

Step 3: Type: FIXMBR at the C:\> prompt and hit «Enter».

Step 4: Press «Y» key > hit «Enter» when asked if you want to write a new MBR.

Step 5:  Restart PC by pressing the «Power» button when the MBR completes the writing process.

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Solution 5. Rebuild MBR without Windows Installation CD/DVD

If you prefer an easier and safer way to rebuild or repair the MBR disk, you may apply third-party partition magic software — EaseUS Partition Master to perform an automatic repair. 

Boot your Windows from the WinPE environment you created and start to repair MBR with a few clicks.

Step 1. Create a WinPE bootable disk

• Launch EaseUS Partition Master, and click «Bootable Media» on the toolbar. Select «Create bootable media».
• Click «Next» to finish the process.

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Step 2. Boot EaseUS Partition Master Bootable USB

• Connect the bootable USB or CD/DVD to your PC. 
• Press F2 or Del when you restart the computer to enter the BIOS screen. Set and boot your computer from «Removable Devices» or «CD-ROM Drive». And then EaseUS Partition Master will run automatically.

Step 3. Rebuild MBR

• Click «Toolkit» and choose «Rebuild MBR».

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• Select the disk and the type of MBR. Then, click «Rebuild».

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• After that, you can see «MBR has been successfully rebuilt on Disk X».

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Solution 6. Repair MBR for HP

Solution 4~5 to corrupted MBR repair is applicable to various computer/laptop brands. On top of that, some brands provide customers with inbuilt tools to deal with MBR issues. For example, the Windows Operating System Disc (OSD) provided with HP notebook PC can be used to repair the Master Boot Record.

Follow all steps at: https://support.hp.com/us-en/document/c00476274

Solution 7. Set the Correct Partition Active

When Windows is running under Legacy BIOS + MBR mode, the boot partition/system partition should be set as active so that MBR can pass boot right to boot manager and find Windows. If the system partition or boot partition is not set to active, you may encounter the operating system not found issue.

In the same partition tool, create the EaseUS Partition Master Bootable USB first, and follow the steps to set the boot partition active:

Step 1. Run EaseUS partition manager software. On the disk map, right-click the target partition and choose «Advanced».

Step 2. Then, select «Set Active» from the drop-down menu. Click «Yes».  And choose «Execute 1 Task(s)» and click «Apply».

Conclusion

All effective solutions to the «Missing Operating System» or «Operating system not found» error are carefully presented on this page. You may try any one of the methods to resolve the issue and get a healthy Windows system back and continue using your computer again.

As long as your are setting an healthy hard drive as the boot drive which could be detected by the BIOS settings, the computer could be able to find and load your OS from the boot drive successfully. When it issue occurs to malfunctioning MBR table, or OS partition is not set as active, you may turn to EaseUS Partition Master for help.

FAQs About Missing Operating Systems or Operating System Not Found

If you still have doubts about this issue, relax and follow the quick answers to each question as listed below.

1. Why is my PC showing missig operating systems?

The causes of missing operating system on Windows computer could be diverse, including OS drive not detected by BIOS, incorrect BIOS settings, MBR corruption, OS drive is not set as active, etc.

2. What is missing operating system Windows 10?

The missing operating system in Windows 10 error is a system error that occurs to most operating systems including Windows 10/11, and older Windows 8.1/8/7/Vista. With this error on a computer, you’ll see that the computer cannot fully boot up from the OS drive. Instead, the computer will present you with a black screen with error messages like «Missing Operating System…» or «Operating System no found…». This error will linger if you can’t find the correct fixes for it.

3. How do I fix a missing operating system Windows 10/7?

According to the solutions provided by this page, you can successfully get rid of missing operating system error on Windows 10 or Windows 7 computers by trying to modifying BIOS settings to its default settings, repairing corrupted MBR partition table, and set OS drive as active, etc. For more details, revert to the repsective solutions on this page for help.

Out of all the errors, glitches, and problems you might encounter while using Windows, few generate as much fear as the dreaded «Operating system not found» screen. Visions of losing your entire media collection, your work, and your precious photos all flash before your eyes.

Stop. Take a deep breath. Your data is still there—and just as importantly, you can fix the problem. Let’s take a look at how to fix the «operating system not found» error on Windows 10 or Windows 11.

1. Force Restart Your Windows

Plenty of Windows troubles such as freezing up or programs malfunctions can be taken care of by a simple restart. In this case, since you are unable to boot your operating system, the only option left is to restart your PC straight from the power button of your computer.

If this was a random one-time glitch, the quick reboot will fix the «Operating System not found» error is no time.

2. Check the BIOS

You need to check for two things in the BIOS. Firstly, you need to ensure your machine recognizes your hard drive. Secondly, you need to make sure the drive on which you installed Windows is listed as the preferred boot drive.

The method for entering the BIOS changes from manufacturer to manufacturer. Typically, you’ll need to press Escape, Delete, or one of the Function keys during the boot-up process, before Windows loads. You should see an onscreen message advising you which is the correct key during the boot process.

The BIOS menu itself also varies between devices. Broadly speaking, you need to locate the Boot tab at the top of the screen. Unfortunately, you can only use your keyboard to navigate the BIOS menu, so keep an eye out for a list of controls on the BIOS screen.

Within the Boot tab, highlight Hard Drive and press Enter. Make sure Hard Drive is listed above USB Storage, CD\DVD\BD-ROM, Removable Devices, and Network Boot. You can adjust the order using the + and – keys.

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If everything in your BIOS menu looked fine, jump to step three. If you didn’t see the hard drive listed, go to step two.

3. Reset the BIOS

If your machine is not recognizing your hard drive, there are lots of possible causes. For non-tech-savvy users, the only easy solution is to try resetting the entire BIOS menu to its default values.

At the bottom of the BIOS menu, you should see a key for Setup Defaults or Reset BIOS. On some machines it’s F9, but it might be different on yours. Confirm your decision when prompted and restart your machine.

If the operating system is still not found, you can stop reading this article. Unless you know a lot about building computers, you’ll need to take your machine to a computer repair shop.

4. Fix the Boot Records

Microsoft Windows primarily relies on three records to boot your machine. They are the Master Boot Record (MBR), DOS Boot Record (DBR), and the Boot Configuration Database (BCD).

If any of the three records becomes damaged or corrupted, there’s a high chance you’ll encounter the «Operating system not found» message.

Thankfully, fixing these records is not as complicated as you might think. You just need a removable Windows installation drive. Use Microsoft’s Media Creation Tool to create some Windows installation media.

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When your tool is ready, you need to use it to boot your machine. Depending on your device, you might only need to press a single key during the boot process, or you might have to change the boot order in the BIOS menu.

Eventually, you will see the Windows Setup screen. Enter your preferred language, keyboard, and time format, and click Next. On the next screen, select Repair your computer.

Next, navigate to Troubleshoot > Advanced Options > Command Prompt. When Command Prompt loads, type the following three commands. Press Enter after each of them:

• bootrec.exe /fixmbr
• bootrec.exe /fixboot
• bootrec.exe /rebuildbcd

Each command might take several minutes to complete. Once all the processes are finished, restart your PC and see if it boots successfully.

5. Enable or Disable UEFI Secure Boot

The Windows operating system has come a long way. However, one thing remains the same. Almost every Windows machine is shipped with UEFI firmware and Secure Boot enabled. However, in some cases, it might not work. For example, if Windows is installed on a GUID Partition Table, it can only boot in UEFI mode. Conversely, if Windows is running on an MBR disk, it cannot boot in UEFI mode.

As such, it’s prudent to either enable or disable UEFI Secure Boot and see if it makes a difference. You make the adjustments in the BIOS menu. Usually, the option will be called Secure Boot and can be found in the Security tab.

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6. Activate the Windows Partition

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It’s possible that the Windows partition is disabled. If that’s the case, then it’s possible to encounter the ‘operating system not found’ error in your PC. You can fix this using Windows’ native diskpart tool. To work through the following steps, you will once again need a Windows installation media USB.

Turn on your machine and boot from the tool. As in step three, you’ll need to enter your language preferences, etc., click Next, select Repair your computer, and go to Troubleshoot > Advanced Options > Command Prompt.

In Command Prompt, type diskpart and press Enter, then type list disk and press Enter. You will see a list of all the disks attached to your machine. Make a note of the disk number you need. Typically, it’s the largest one.

Next, type select disk [number], replacing [number] with the aforementioned number. Press Enter.

Now type list volume and press Enter. It will show you all the partitions on the disk you selected. Establish which partition Windows is installed on and make a note of the number, then type select volume [number], again replacing [number] with the number you just noted.

Finally, type active and press Enter. To see if the process was successful, restart your machine.

7. Use Easy Recovery Essentials

Easy Recovery Essentials is a third-party app that specializes in fixing boot issues. If none of the previous five steps have worked, it’s worth trying.

In addition to fixing the «Operating system not found» message, it can also solve other common startup error messages. They include:

• INACCESSIBLE_BOOT_DEVICE.
• INACCESSIBLE_BOOT_VOLUME.
• UNMOUNTABLE_BOOT_VOLUME.
• BOOTMGR is missing.
• The Boot Configuration Data for your PC is missing or contains errors.
• An error occurred while attempting to read the boot configuration data.
• Boot.ini not found.
• … and more.

Just download the app, burn the ISO to a CD, and use the CD to boot your machine. The app’s wizard guides you through the repair process.

Download: Easy Recovery Essentials ($40, free for Windows 11)

8. Reinstall Windows

If none of the methods above have worked so far, then perhaps a complete reinstallation is in order. Don’t worry, you won’t lose any of your data though. Now, since you can’t launch your PC, you will have to reinstall your Windows straight from a USB drive, as laid out by Microsoft.

So plug in your bootable USB drive and boot your PC from the USB. If you don’t have a bootable USB yet, you can check out our guide on creating a bootable USB from scratch and get your work started. If your Windows doesn’t boot, you might first have to change the booting order so that the OS can load boot up through your USB. To do that, press the Esc/F10/F12 or the relevant key to boot into the boot-selection device. Once you’re there, change the booting order to boot from your USB.

The process is fairly straightforward from there. Just follow the on-screen instructions, launch the installation wizard and wait while it installs a new copy of Windows.

Last Resort: Head to the Shops

Our tips should help you fix the operating system not found error on Windows in all but the direst of circumstances. Unfortunately, however, it’s just one of many error messages that you’re likely to encounter while using Microsoft’s operating system.

If you can’t work out what is wrong with your machine, it makes little sense to keep fiddling. If you are not tech-savvy, you might do more harm than good. As a last resort, head to your local PC repair shop, and they should be able to get you up and running again in no time.

Fixing the «Operating System Not Found» Error on Windows PC

Regardless of if you fix the problem yourself, or you need professional help, you’ll hopefully get a PC that remembers it has an operating system again. Best of all, your files should all be safe and sound!

Microsoft Windows, by itself, is full of potential errors, and its official Store is no different. However, there are ways you can fix any issues you come across with the Microsoft Store.

Сообщение ‘
Operating System not found'
‘ или ‘
Missing Operating System
‘ при включении компьютера говорит о том, что на диске отсутствует загрузчик операционной системы. Соответственно ваш компьютер не может найти и запустить загрузчик Windows (или другой ОС, установленной на компьютере) или среду восстановления Windows (WinRE)

Ошибка при загрузке также может выглядеть так:

An operating system wasn't found. Try disconnecting any drives that don't contain an operating system. Press Ctrl+Alt+Del to restart.

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Конкретный текст ошибки может отличаться в зависимости от вендора, или версии UEFI/BIOS. Во всех случаях ошибка указывает на то, что на диске не обнаружен загрузчик операционной системы.

Например, на компьютерах и ноутбуках Lenovo аналогичная ошибка выглядит так:

Error 1962: No operating system found. Boot sequence will automatically repeat.

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Или:

Missing operating system.
No bootable device.

Причины ошибки ‘Operating System not found’

Самый частые причины, из-за которых при загрузке появляется ошибка “операционная система не найдена”:

• испорченный системный раздел; отсутствует или повреждена MBR запись; нет активных разделов (или неверный раздел диска помечен активным);
• поврежден загрузчик Windows (BCD) или удален загрузочный раздел;
• не подключен HDD/SSD с установленной операционной системой (включая: плохое соединение шлейфа, аппаратные проблемы с диском, RAID или контроллером).

Поэтому для исправления ошибки с обнаружением загрузчика операционной системы в первую очередь нужно проверить:

• Жесткий диск с ОС должен быть подключен к компьютеру. Отключите все дополнительные диски, извлеките подключенные USB накопители ( на это указывает наличие надписи Try disconnecting any drives that don’t contain an operating system);
• проверьте надежность подключения кабелей питания и шлейфов жетских дисков;
• убедитесь, что ваш жесткий диск определяется в BIOS/UEFI и выставите его в качестве первичного загрузочного устройства (в разделе Hard Disk Priority / Boot Device Priority);
• Если перед возникновением проблемы вы переключали ражим работы SATA контроллера в BIOS, например, с AHCI на IDE или RAID (или наоборот), верните исходный режим SATA);
• В некоторых случаях может помочь сброс настроек BIOS на стандартные (опция Restore Defaults, Load Setup Defaults, или Load Fail-Safe Defaults»;
• проверьте настройки Secure Boot в UEFI, возможно он были изменены (проверьте загружается ли Windows с включенным и отключенным режимом Secure Boot и в Legacy режиме).

Если все это выполнено, а Windows не загружается, нужно восстановить загрузчик и загрузочную запись Windows.

Как определить разметку диска и найти диск с установленной Windows

Для восстановления загрузчика вам понадобится загрузочная USB флешка с Windows или Live CD.

Измените порядок загрузки в BIOS (UEFI) и загрузитесь с вашего загрузочного/ установочного диска и запустите командную строку (если у вас установочный диск, на экране выбора языковых параметров нажмите сочетание клавиш
Shift+F10
).

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В первую очередь нужно определить тип таблицы разделов на вашем диске: GPT или MBR. От этого зависит способ восстановления загрузчика Windows.

Запустите:
diskpart

Выполните:
list disk

Если у диска в столбце Gpt указана звездочка (*), тогда используется таблица разделов GPT, если нет – MBR.

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Выведите список томов на диске:

list vol

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Завершите сеанс:
exit

Судя по размеру дисков, Windows скорее всего установлена на диске E:. Проверим этом, выполнив команду:
dir e:

Как вы видите, на диске имеются каталоги
Windows
,
Program Files
,
Users
и прочие.

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Итак, мы определили тип разметки диска и букву раздела, на котором установлена Windows. В зависимости от типа разметки перейдите в соответствующий раздел статьи.

Восстановить загрузчик Windows на MBR диске BIOS системы

Итак, вы определили, что на диске с Windows используется таблица разделов MBR. Это означает, что на вашем компьютере используется BIOS (или компьютер содержит UEFI прошивку, но вы загружаете операционную систему в режиме совместимости: Legacy/CSM).

Создайте конфигурационные файлы загрузчика на диске
E:\
:

bcdboot E:\Windows /S E:

Должно появится сообщение
Boot files successfully created
.

Пересоздайте MBR (Master Boot Record) запись:

bootrec.exe /FixMbr
bootrec.exe /FixBoot
bootrec.exe /RebuildBcd

Теперь нужно сделать активным раздел с Windows (BIOS передает управлению загрузчику операционной системе на активном MBR разделе):

В этой статье мы не показываем процесс пересоздания загрузочного раздела System Reserved, т.к. загрузчик bootmgr вполне может находится и на диске с Windows.

diskpart
list disk
sel disk 0
list vol

select volume 2
(ранее мы определили, что Windows установлена на этом томе)
active
exit

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Перезагрузите компьютер, и убедитесь, что Windows загружается корректно без ошибки “Operating System not found”.

Восстановить загрузчик Windows на GPT разделе компьютера с UEFI

Если ваш диск размечен в таблице разделов GPT, значит компьютер использует UEFI архитектуру вместо BIOS. Полный гайд по восстановлению загрузчика Windows 10/11 на UEFI компьютере содержится в статье: Восстановление загрузчика Windows (UEFI). Вкратце рассмотрим основные шаги.

Сначала нужно найти и назначить букву системному разделу EFI (Extensible Firmware Interface, или EFI System Partition — ES) с файловой системой FAT32. По умолчанию размер EFI раздела 100 мб. Именно на этом разделе находится загрузчик EFI и Windows Boot Manager. Также здесь хранится файл с конфигурацией загрузчика BCD.

Diskpart
List vol

Например, вы определили, что у вас это том
Volume 1
с меткой
System
.

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Выберите этот EFI раздел и назначьте букву диска:

select volume 1
assign letter M:
exit

Пересоздайте конфигурации загрузчика на EFI разделе:

cd /d m:\efi\microsoft\boot\
ren BCD BCD.bak
bcdboot E:\Windows /l en-us /s M: /f ALL

Эта команда должна скопировать файлы среды загрузки Windows из каталога E:\Windows (. ранее мы определили, что в нашем случае Windows установлена на диске E:).

Перезагрузите компьютер, извлеките загрузочный диск (флешку) и проверьте, что Windows загружается корректно

Operation System Not Found в виртуальной машине VMware

Ошибка Operating System not found может появится при заргрузке виртуальной машине на VMware ESXi или Workstation.

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Для решения этой проблемы в вириальной машине VMware проверьте следующее:

Last Updated :
07 Apr, 2025

If your computer suddenly shows a «Missing Operating System» error message, don’t panic! This issue can occur due to various reasons, but there are 5 simple solutions to fix it. Your operating system is crucial for your computer to function, so resolving this issue is essential.

On Windows, when you boot the device, you get the Windows Error Message on the Blue Screen that Missing Operating System & this prevents you from entering the system. In this article, we’ll walk you through these 5 solutions to Fix Missing Operating System errors step by step, so you can get your Windows system up and running smoothly again.

Reasons Behind «Missing Operating System» Error on Windows

The Basic Input Output System or BIOS is the main initiator of device booting on Windows. The BIOS itself approaches the OS that loads the entire system. If there is any issue with the BIOS or the Driver on the device where the OS is installed, you might get a Windows Missing OS Error. Some of the reasons why Missing Windows OS Problems arise are the following.

• The Hard Disk or Driver failed to deliver the OS to the BIOS.
• The Hard Disk or Driver becomes inactive.
• There are some faulty modifications are done in the BIOS Settings.
• The Master Boot Record on BIOS is damaged.
• The Disk Partition where the OS is installed becomes inactive.

How to Fix Missing Operating System Error on Windows?

To Fix the Missing Operating System issue, the following detailed methods should be executed. We will start with the Simple BIOS Default Settings Restoration method.

Solution 1: Reset the BIOS Default

Step 1: While Restarting the device, press the Del Key multiple times to Enter into BIOS. Now, press the F9 Key there to restore the Default Settings.

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Step 2: Then, click on the YES to restore & complete the process.

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Solution 2: Access the Driver from the Boot

Step 1: On the Boot Menu, click on the Troubleshoot option.

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Step 2: Now, go for the Command Prompt option.

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Step 3: Execute the following command. It will help to check the access to the Driver from the Boot & if there is any issue will be resolved.

Command: bootsect /nt60 sys

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Solution 3: Fix Hard Drive

Step 1: Again open the Boot Menu by pressing F2 Key Multiple Time. Now, click on the Troubleshoot option.

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Step 2: Now, go for the Command Prompt option.

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Step 3: Execute the command on the Boot CMD. It will check the driver’s problem without getting inside the device.

Command: chkdsk /f d:

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Solution 4: Rebuild the Master Boot Record

Step 1: Again open the Boot Menu & click on the Troubleshoot option.

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Step 2: After that, select the Command Prompt option.

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Step 3: The following command needs to be executed. It will check the Master Boot Record or MBR. And all the issues will be fixed.

Command: bootrec /fixmbr

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Solution 5: Activate the OS Disk Partition

Step 1: Open the Boot Menu & click on the Troubleshoot option.

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Step 2: Go for the Command Prompt option.

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Step 3: After that, execute the Diskpart Command on the CMD.

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Step 4: At last, execute the following command to select the volume where the OS is installed. And using the Active Command, mark the Disk Partition as active.

Command: select volume <Volume Number>

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Conclusion

As we can see, these are the few simple yet important methods used to resolve How to Resolve Missing Operating System Issues on Windows. After executing all the methods, if the Missing OS on Windows Issue doesn’t get solved, then you have to produce the system before any technician as there might be some major fault occurring.