Если переустановка нужна для того, чтобы восстановить работоспособность «Защитника», сначала ознакомьтесь с нашим отдельным материалам, где описаны наиболее распространенные проблемы и возможные пути их решения. Вероятно, после применения разобранных способов уже не потребуется переустановка средства.
Подробнее: Не запускается встроенный «Защитник» в Windows 10
Шаг 1: Отключение Microsoft Defender
Перед установкой «Microsoft Defender» придется его отключить. Поскольку средство защиты является системным, полностью его удалить нельзя, да и не рекомендуется это пытаться делать.
Делается это как через штатные средства системы, так и с помощью специализированных утилит, которые устанавливаются отдельно. Ранее наш автор разбирал способы полной деактивации встроенной защиты операционной системы в другом руководстве. Сначала перейдите к нему, выключите «Защитник», после чего можно переходить к следующему шагу данной инструкции. Соблюдая эти рекомендации, вы минимизируете возможность конфликта программного обеспечения при установке.
Подробнее: Отключение Защитника в Windows 10
Шаг 2: Скачивание и установка
Следующий этап – это непосредственное скачивание «Защитника» Windows с официального сайта компании Microsoft. В этом случае сторонние источники для загрузки не подойдут, поскольку важна безопасность и надежность. «Defender» распространяется производителем бесплатно, а алгоритм действий достаточно прост:
Скачать Microsoft Defender с официального сайта
- Кликните по кнопке выше, чтобы перейти к скачиванию «Защитника» с официального ресурса. На открывшейся странице нажмите на кнопку «Install».
- Во всплывающем окне браузера выберите «Открыть приложение».
- После этого запустится приложение официального магазина Microsoft Store, которое должно быть предустановлено у вас в системе. Нажмите на кнопку «Получить» и дождитесь скачивания защитного средства. Инсталляция выполнится автоматически сразу после загрузки.
Читайте также: Установка Microsoft Store в Windows 10
Если в дальнейшем потребуется переустановить и эту версию программного обеспечения (скачанное из магазина приложений Microsoft Store), то можно сначала удалить софт, используя встроенные возможности системы. Например, для этого подойдут штатные «Параметры»:
- Нажмите на кнопку «Пуск», затем выберите «Параметры».
- Перейдите в раздел «Приложения».
- В отобразившемся списке установленных программ найдите «Microsoft Defender», кликните по названию левой кнопкой мыши, затем нажмите на появившуюся кнопку «Удалить».
Останется подтвердить действие и дождаться полного удаления программы с компьютера, а затем можно переходить к скачиванию и проделать то же самое, что в предыдущей инструкции. Следует отметить, что в магазине от Microsoft всегда доступна для скачивания актуальная версия программного обеспечения, поэтому зачастую переустановка таких приложений позволяет избавиться от некоторых проблем или ошибок в работе софта.
Если в вашей сборке Windows (касается нелицензионных копий от сборщиков) изначально отсутствует «Защитник», вернуть его не получится никаким образом.
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Here’s a guide for Microsoft/Windows Defender download, install, uninstall and reinstall on Windows 10/11. Utilize this best free antivirus software for Windows to protect your computer from threats. For more computer troubleshooting tips, you can visit MiniTool Software official website.
This post mainly introduces how to download Windows Defender on Windows 10/11 computer. 3 ways are offered to let you get the Microsoft Defender app. You can also learn how to uninstall and reinstall Windows Defender on Windows 10/11, how to fix Windows Defender can’t open/start issue, how to recover deleted or lost files from your PC, etc.
Also read: Learn the best tips and tricks for data recovery hard drive on Windows 11/10/8/7.
About Windows Defender
Windows Defender, also known as Microsoft Defender or Windows Security, is a 100% free antivirus program developed by Microsoft. It is included in Windows 11/10/8/8.1/7/Vista.
Windows Defender offers 4 scan modes: full scan, quick scan, custom scan, and offline scan.
Users can open Windows Defender on Windows 10/11 and turn on or off the real-time protection, enable or disable firewall & network protection, change the automatic scanning settings, adjust the advanced protection settings, and more.
Check for more information about how to stay protected with Windows Security.
How to Download and Install Windows Defender on Windows 10/11
Windows Defender is automatically installed for free on all PCs that run on Windows 11/10/8/7. If you can’t find Windows Defender on your computer, generally, you have 3 ways to get Windows Defender.
Way 1. Update Windows OS
You can try to update Windows 11/10 to the latest version to see if Windows Defender comes back.
To update your system, you can click Start -> Settings -> Update & Security (Privacy & Security) -> Windows Update -> Check for updates. You can also use this way to update Windows Defender to the latest version on Windows 10/11.
Way 2. Manually Download and Install Windows Defender on Windows 10/11
- Open Microsoft Store on your Windows computer. For Windows 11, you can click the Microsoft Store icon on the taskbar to open it. You can also press Windows + S, search for Microsoft Store in the search box, and click the Microsoft Store app to open it.
- In Microsoft Store, you can type Microsoft Defender Preview in the search box, and choose the Microsoft Defender Preview app.
- Click the Get button or Get in Store app button to download Microsoft Defender for Windows 10 or 11.
Way 3. Find Third-party Windows Defender Download Websites
You may also find some third-party reliable websites to get Microsoft Defender. Some websites are listed below for your reference, but you should identify by yourself if the Windows Defender download resource is reliable.
- https://windows-defender.en.softonic.com/download
- https://downloads.digitaltrends.com/windows-defender/windows
- https://www.filehorse.com/download-windows-defender-64/
- https://download.cnet.com/Microsoft-Windows-Defender/3000-8022_4-55082.html
Related: How to Enable or Disable Microsoft Defender in Windows 11
Download Microsoft Defender for Android from Google Play Store
If you want to download Microsoft Defender for Android, you can open the Play Store on your device, search for Microsoft Defender, and tap the Install button to download and install Microsoft Defender for your Android phone or tablet.
How to Uninstall and Reinstall Windows Defender on Windows 10/11
If you want to uninstall the built-in Windows Defender app on Windows 10/11, you may need to use Windows PowerShell to do it. You may refer to this post: How to Uninstall, Restore, Reinstall Windows 10 Built-in Apps.
If you download and install Microsoft Defender from Microsoft Store or other third-party websites, you can open Control Panel on Windows, right-click the Microsoft Defender app and select Uninstall to remove it from your computer.
After you uninstall Windows Defender, you can follow the instructions above to reinstall Windows Defender if you want.
Fix Windows Defender Can’t Open/Start on Windows 10/11
If you can’t open Windows Defender on your computer, you may try the 10 tips below to see if they can help bring this free antivirus app back to normal working.
Fix 1. Restart your computer and try to open Windows Defender again.
Fix 2. Update Windows system.
You can follow the guide above to update your Windows 10 or 11 OS to see if Windows Security can work normally again.
Fix 3. Run SFC scan.
You can perform a system scan to repair possible corrupted system files in your device.
- Press Windows + R, type cmd, and press Ctrl + Shift + Enter to open Windows Command Prompt.
- Type sfc /scannow command and press Enter to run the SFC tool to automatically check and fix corrupted system files. If this command doesn’t work, you can type DISM /Online /Cleanup-image /RestoreHealth command and press Enter to run this command first.
Fix 4. Reset Windows Defender app.
If Windows Defender is not working well on your computer, you can follow the operation below to reset the app settings to default to see if it helps.
- Press Windows + X and select Windows PowerShell (Admin). For Windows 11, select Windows Terminal (Admin).
- Type the command: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage. Press Enter to execute the command.
Fix 5. Uninstall and reinstall Windows Defender. The instructions are introduced above.
Fix 6. Disable any third-party antivirus software on your computer since it may be conflicted with the Windows Defender antivirus program.
Fix 7. Use third-party antivirus software.
If Windows Defender has problems or can’t work on your computer, you can turn to some third-party top free antivirus software for Windows 10/11.
Fix 8. Start Windows in Safe Mode to see if Windows Defender can smoothly open and work.
Fix 9. Perform a System Restore. If you still favor Windows Defender and do not want to use other antivirus applications, you can try to restore your Windows system to a previous state to see if the Windows Security app can work properly.
Fix 10. If Windows Defender is not working and you have some other problems on your computer, you may reinstall your Windows OS.
Note: Before you perform the system restore or reinstall your computer, it’s highly advised you make a backup of your Windows system and important data.
How to Recover Deleted/Lost Files on Windows 10/11 for Free
If your computer has problems and you lost some important data, you can try a professional data recovery program to restore the lost data from your PC.
MiniTool Power Data Recovery is a top data recovery program that helps you recover data from various data loss situations. You can use it to recover permanently deleted files, recover data from a corrupted/formatted hard drive, recover data after malware/virus infection, recover data when the PC won’t boot, and more. Unless the hard drive is physically damaged and can’t be recognized by your computer, you can try this tool to restore data.
As for supported devices, you can use MiniTool Power Data Recovery to recover any deleted/lost files from a Windows PC or laptop, USB flash drive, memory card, external hard drive, SSD, etc.
Download and install MiniTool Power Data Recovery on your Windows PC or laptop, and check the guide below for how to use it to recover data.
MiniTool Power Data Recovery FreeClick to Download100%Clean & Safe
- Launch MiniTool Power Data Recovery to access its main interface.
- On the main UI, you can choose the drive or device you want to scan. If you know which drive contains your deleted/lost files, you can select the target drive under Logical Drives and click Scan. If you don’t know which drive to scan, you can click the Devices tab, select the whole disk or device and click Scan. For an external device, you need to connect it to your Windows computer beforehand.
- Let the software finish the scan. After that, you can check the scan result and find if the target files are listed, if so, check those files and click the Save Then you can choose a preferred new location to store the recovered files.
Tip: If you only want to scan a specific type of file, you can click the Scan Settings icon in the left panel of the main UI and choose the file types you want to scan.
Free Disk Partition Manager for Windows 11/10/8/7
If your computer has problems or you reinstalled your OS, you may need a professional disk partition manager to repartition the hard disk or manage the hard drives from other aspects.
MiniTool Partition Wizard is a popular free hard drive partition manager for Windows. It lets you manage hard drives and partitions from all aspects.
For partition management, you can use it to create, delete, extend, resize, split, merge, format, wipe partitions, convert partition format, check file system errors, change the drive letter, and more.
For disk management, you can use MiniTool Partition Wizard to migrate OS to SSD/HD, copy disk, recover lost partitions, convert disk format, wipe disk, test hard drive speed, analyze hard drive space, and more.
This disk partition manager is extremely easy to use and fulfills all your hard disk management needs. It is free and clean. You can download and install MiniTool Partition Wizard on your Windows PC or laptop to test it now.
MiniTool Partition Wizard FreeClick to Download100%Clean & Safe
Free PC Backup Software for Windows 10/11
For system and data backup on a PC, you can utilize a professional free PC backup tool.
MiniTool ShadowMaker is one of the best free PC backup utilities that supports Windows system backup and file backup.
You can use it to easily create a system image backup of your Windows OS and restore your OS from the backups when needed.
As a professional PC backup application, you can also use it to back up any files on your computer at a fast speed. You can easily select files, folders, or partitions to back up to external hard drives or USB flash drives. You can even select the whole disk content to back up.
Besides, it also offers another backup module: File Sync. You can easily sync data to the target device to make a backup.
Many other backup features are provided, e.g. disk clone, automatic backup, incremental backup, etc.
Use this top free PC backup tool to keep your computer data safe.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
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Conclusion
This post offers a guide for Windows Defender download, install, uninstall, and reinstall on Windows 10/11. Some tips to help you fix Windows Defender not working or can’t open problem are also provided. Some useful free Windows tools are offered to help you with data recovery, system and data backup, and disk partition management. Hope it helps.
If you have any problems with using MiniTool Software products, you can contact [email protected].
Download Windows Speedup Tool to fix errors and make PC run faster
If Windows Security is crashing or not opening, you can reset and re-register the Windows Security app and get the issue fixed. In this post, we will show you the 3 quick and easy ways to reset or repair Windows Security or reinstall Windows Defender in Windows 11/10.
You can perform this task in either of four ways to reset or repair Windows Security or reinstall Windows Defender:
- From Windows Settings
- From Start Menu
- Via PowerShell
- Via Command Prompt
Let’s see a description of the process involved with each of the methods.
1] Repair or Reset Windows Security via Settings
To repair or reset Windows Security open the Windows Settings app, and select System settings from the left side.
On the right side, click on System Components.
Next, locate Windows Security and click on the 3-dots link to show the Advanced options flyout. Click on it.
Now you will see the options to Repair or Reset the Windows Security app.
Choose the option you desire, click the button, and wait for the process to complete.
2] Reset Windows Security app from Start Menu
You can also reset Windows Security app directly from the Start Menu:
- Press the Win+I key on the keyboard to open Settings.
- Click on App settings on the left side
- The System components page for Windows Security will open
- Here you can click on the Repair or Reset button.
- Wait for the process to complete, and then exit Settings.
3] Reset Windows Security app in PowerShell
Do the following:
- Press Windows key + X to open the Power User Menu.
- Then press i on the keyboard to launch PowerShell.
- In the PowerShell console, type in or copy and paste the command below and hit Enter.
Get-AppxPackage *Microsoft.Windows.SecHealthUI* | Reset-AppxPackage
Once the command executes, you can exit the PowerShell console.
4] Reinstall and re-register Windows Security app in Command Prompt
Do the following:
- Press Windows key + R to invoke the Run dialog.
- In the Run dialog box, type
cmdand hit Enter to open Command Prompt. - In the command prompt window, type or copy and paste the command below and hit Enter.
PowerShell -ExecutionPolicy Unrestricted -Command "& {$manifest = (Get-AppxPackage *Microsoft.Windows.SecHealthUI*).InstallLocation + '\AppxManifest.xml' ; Add-AppxPackage -DisableDevelopmentMode -Register $manifest}"
That’s it!
Related post: How to Reset Windows Security Security Settings to default values in Windows.
What will happen if I reset Windows Security?
When you reset Windows Security, everything from your security key will be deleted and reset to factory defaults. All data and credentials will be cleared. In short, all data belonging to this app will be cleared.
Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP (2006-16) & a Windows Insider MVP (2016-2022). Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.
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You must Reinstall Windows Defender Firewall when it stops functioning the way it should. Without firewall working, your PC is more open to threats and viruses. So, the best way to make firewall work is to reinstall it completely. You may like to Turn On / Off Firewall & Network Protection on Windows 10.
Many times, when a PC gets infected, the malware or virus change the firewall settings, which in turn makes this integrated security tool non-operable. Also, in some cases, users try to configure firewall settings and end up messing everything. Therefore, if firewall stops working on your PC for varying computer reasons, then quickly Reinstall Windows Defender Firewall.
But to do so, you have to run few commands one after the other in an elevated Command Prompt. Hence, let us head towards the steps and see the method of reinstalling firewall.
Follow Windows 10 Tips to Run a Program Using Administrator Privilege to know more.
How to Reinstall Windows Defender Firewall in Windows 10
Step 1 – To Reinstall Windows Defender Firewall, open Start Menu, and type cmd. This will show up Cortana with Command Prompt as the Best match. Simply, make a right-click on the result and choose the option namely Run as administrator.
In addition, you can also Launch Elevated Command Prompt on Windows 10 using more ways.
Step 2 – This action will launch UAC prompt on your PC screen, select Yes.
Step 3 – Copy-paste the below line of commands one by one to Reinstall Windows Defender Firewall in Windows 10. Well, make sure to press Enter after pasting every command to execute them
Recreate the Service
Rundll32 setupapi,InstallHinfSection Ndi-Steelhead 132 %windir%\inf\netrass.inf
Start Windows Defender Firewall Service
sc start mpssvc
Reset Windows Defender Firewall Configurations
netsh advfirewall reset
netsh advfirewall set domainprofile state on
netsh advfirewall set privateprofile state on
Step 4 – After running all the above commands perfectly, it’s time to Restart Windows 10 PC. Restarting the PC will successfully Reinstall Windows Defender Firewall in Windows 10.
Conclusion
So, hopefully, by following the above simple series of commands you will be able to Reinstall Windows Defender Firewall. Well, you all know that without firewall functioning properly, there are chances for your PC to get infected. Though Microsoft is developing things quite frequently, you also need to take care of your PC at the same time. In case, you have any other way of reinstalling this specific security of Windows 10, write down to us.
If you’ve recently been hit by a virus or malware attack and notice that the Windows Defender Security Center Service is gone from the services.msc on your Windows 11 or 10 PC, it’s a pretty serious issue you’re facing right now. This means that Windows Defender is not active at the moment to protect your computer and you might be at risk for more attacks.
In this post, we’ll talk about why this happens and show you some steps to get the missing Windows Security Center Service back.
What is the problem?
Here’s the issue: you try to turn on Windows Defender after a malware mess, and get a message saying, “Security at a glance – Page not available” when you try to look at the Windows Security settings. When you peek into Services.msc, the Windows Security Center Service isn’t there, which means you can’t turn on Windows Defender.
Sometimes, you might even see a pop-up saying “You’ll need a new app to open this windowsdefender link” when trying to open the Windows Security settings.
Well, there are a few things that can cause this issue. In most cases, it’s because of a very intelligent virus or malware that has messed up your Security Center service and making it disappear so you cannot turn it on. The very first thing you should try is to restart your computer and see if the service comes back. If not, proceed to the following solutions.
Related issue: Windows 11 Security Tab Missing in Properties
How to fix Windows Security Center Service not found issue
Well, there are a few workarounds to fix the missing Windows Security Center Service issue. We’ll go through the fixes below.
Reinstall Windows Defender
First off, try reinstalling Windows Defender. This can bring back all the needed services for Windows Defender and Security Center. You can do this with a few methods, like using a simple PowerShell command. Give this a shot first and see if it sorts out the problem. If not, move on to the next step.
Restore Windows Defender Service using registry
If reinstalling didn’t help, you can get the Windows Defender Service back in Windows 11 or 10 using a registry file. But, you’ll need to start regedit.exe as TrustedInstaller first.
Also see: Windows Registry Key “Access is Denied” Error
Run regedit.exe as TrustedInstaller using Advanced Run
Advanced Run is a very useful tool from Nirsoft that lets you run programs with extra permissions, like as an administrator or TrustedInstaller. It’s great for when you need special access to run certain programs, such as this situation now. With Advanced Run, you can start regedit.exe as TrustedInstaller to add the registry key needed to get the Windows Defender Service back.
- Get Advanced Run from Nirsoft and unzip it somewhere on your computer.
https://www.nirsoft.net/utils/advanced_run.html
- Open the folder and double-click on the “AdvancedRun.exe” file.
- Hit the “Browse” button and find the Registry Editor executable file (regedit.exe) or type in the path: “C:\Windows\regedit.exe“.
- In the “Run As” section, pick “TrustedInstaller” from the list.
- Press the “Run” button to open regedit.exe as TrustedInstaller.
Import the Windows Defender Service restoration registry file
With regedit.exe running as TrustedInstaller, you can now add the registry file to get the Windows Defender Service back.
Warning: Messing with the registry can be risky. If you’re not sure, it might be better to ask for help from someone who knows what they’re doing. Always make a system restore point or back up the registry before changing anything, just to be safe.
- Download our restore Windows Defender service registry fix.
- Unzip the file (better to do it on the C: drive).
- In the Registry Editor, click File and choose Import.
- Find the registry file for your version of Windows. If you’re on Windows 11, pick the RestoreWindowsDefender-Windows11.reg file.
- Click Yes when asked for confirmation.
- Close the Registry Editor and restart your computer.
After a restart, check if the Security Center Service is back. If it is, make sure to update Windows Defender right away.
If the Security Center Service is still missing, you might have to think about resetting or doing a clean install of Windows 11/10.
Reset or clean reinstall Windows 11/10
If nothing else worked, you might need to reset or do a clean install of Windows 11 or 10. Resetting Windows lets you keep your files (not all files) but removes apps and drivers, while a clean install wipes everything and starts fresh. These steps might take some time but can help restore the missing Windows Defender or Security Center service.
But, a clean install should always only be considered as a last resort. And always back up your important files that you couldn’t afford to lose before doing so.
Repair Windows Security services with SFC and DISM
When things like this happen, it’s a common practice to try running the SFC (System File Checker) and DISM (Deployment Image Servicing and Management). This is to fix any corrupted or missing system files, which include things like the Windows Defender Security Center Service.
To run SFC, open Command Prompt as an admin and type “sfc /scannow” then press Enter. It might take a while, but it will tell you if it found and fixed any issues.
To run DISM, open Command Prompt as admin and type “dism /online /cleanup-image /restorehealth” then press Enter. This scan can also take a bit but can help fix system image issues.
What to do if the Windows Security Center Service disappears again
If the Windows Security Center service vanishes again, it might mean your computer is still under attack by the same or different malware. In this situation, you’ll have to react quickly and use a trusted antivirus to run a full scan on your system. Pick a well-known antivirus that’s good at finding and getting rid of malware and viruses.
If it finds anything, follow the antivirus’s advice to remove the malware. After the threats are gone, you can try to get the Windows Security Center service back again.
Some final words
To prevent similar issue from happening again, keep everything updated, use reliable antivirus software, and be careful online. Avoid sketchy websites, don’t download stuff from people you don’t trust, and watch out for scams. We hope this guide helps you fix the missing Windows Defender Security Center Service issue.