Zeug was ich net wieder stundenlang suchen will….

These commands will scan and repair any corrupted system files.
run one after another.
sfc /scannow
DISM /Online /Cleanup-Image /RestoreHealth

Reinstall Startmenu:
Get-AppxPackage Microsoft.Windows.StartMenuExperienceHost | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

https://github.com/zoicware/RemoveWindowsAI

https://github.com/MSEndpointMgr/Windows/blob/master/BuiltInApps/Remove-Appx-AllUsers.ps1