
How to Reinstall the Windows Security Module
If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...
Software troubleshooting desk

If Windows Security won't open, shows errors, or you see "This app has been turned off" messages,...

If Windows Security settings become misconfigured—perhaps after a third-party antivirus installat...

When you run Invoke-WebRequest in PowerShell and get a 502 Bad Gateway

If Windows Defender won't start or you see warnings that it's turned off, the underlying service ...

If you see "cannot access file because it is locked" in Windows Terminal, it usually means anothe...

You see a 504 Gateway Timeout error when checking for Windows Updates. This usua...