Hi,

sometimes it happens that the Windows Security App won’t open.

The possible solutions

Reset the Appx package

PS D:\> Get-AppxPackage Microsoft.Windows.SecHealthUI | Reset-AppxPackage

Or reinstall the Appx package for the logged on user

PS D:\> Add-AppxPackage -DisableDevelopmentMode -Register ((Get-AppxPackage Microsoft.Windows.SecHealthUI).InstallLocation + '\AppxManifest.xml')

Michael