Windows Security Not Working

NMI said:

How to Fix You’ll Need a New App to Open This Windowsdefender Link Windows 11/10

Just try the above method and you can easily fix it.

NMI said:

Just try the above method and you can easily fix it.

This worked for me. The MiniTool instructions.

Background: at first when I went into powershell (admin not needed to list them) and type:

Code:

Get-AppxPackage | ft

In the resulting list of 29 items, Microsoft.Windows.SecHealthUI was NOT listed. It was totally missing.

So none of the more common "re-register" steps would work because they require Get-AppxPackage to see it and on my system it couldn't.

But the MiniTool approach gets at it from the file location on disk:

C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy

This WAS there on my system.

So, opening powershell admin (right click start menu) and running MiniTool's suggestion, namely,

Code:

Add-AppxPackage -Register –DisableDevelopmentMode "C:\Windows\SystemApps\Microsoft.Windows.SecHealthUI_cw5n1h2txyewy\AppXManifest.xml"

fixed it. It essentially reinstalled it. Then it appeared in the list returned from Get-AppxPackage and the "Open Windows Security" button in settings worked.