In this article, I will show you how to fix Windows Defender is Not Working/Not opening in Windows 11
First think you can do is open Windows Power Shell, to do that open search bar and search for Windows Power Shell, right click on it and press yes
Here you have to past two commands
First command and press Enter and second command and press Enter
Get-AppxPackage *Microsoft.SecHealthUI* | Reset-AppxPackage
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackageAfter that restart your computer
If Windows Defender is still not working you have to do a clean reinstall
First, you have to go to Windows 11 Download Page and Download the Windows 11 Media Creation Tool from the Create Windows 11 Installation Media section.
After you download it, open Media Creation Tool and Download the Windows 11 ISO.
Double click on the Windows 11 ISO and then open the setup.
After that, you have to make sure that you checked Keep personal files and apps if you want to keep all of your files.
Press Next and after the installation has been completed your Windows Defender problems will be Fixed.
For a more in-depth explanation, you can watch the video below from the youtube channel.