
How to Reinstall the Windows Security App (Microsoft Defender)
If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...
Software troubleshooting desk

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

When you open Microsoft Store and see the error 'Service unavailable' or a message like 'Somethin...

You open the Microsoft Store and see an error like “module not found” or a specific error code su...

If you open Windows Security (Windows Defender) on Windows 11 and see only a blank or white scree...

You might see the error "OneDrive sync port already allocated" on Windows 10 whe...

You try to install or update an app from the Microsoft Store, and you get an error about a depend...