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Windows 11's Windows Security App can't open.
Alright guys, just now I'm trying to disable the Windows defender but I found out that I can't even open the Windows Security App. Anyone knows what's going on? Any solution? I'm looking for help. ...
Hello,Suggest try the following steps:
- Open PowerShell by using Administrator rights
- Copy and paste Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage to the PowerShell window and press enter
- Close the PowerShell and retry
MASA-0 I got the same error, so this is what I did:
Open PowerShell, type: Get-AppxPackage Microsoft.SecHealthUI -AllUsers
Type enter.
Open it again and type everything now: Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
Type enter.
Close PowerShell and try opening the Windows Security app. It worked for me! 
Thank you so much finally got it working by following your steps.