Knowledge base for software setup, errors, and daily tool work.

Windows Defender Not Opening? Here's How to Fix It

You click the Windows Defender icon, but nothing happens—or you get an error saying the app didn'...

How to Fix 'File Locked by Another Program' in Windows Security

You try to delete, rename, or move a file and get the error “The action can’t be completed becaus...

Fix 'Microsoft Store command not found' in PowerShell

When you run microsoft-store in PowerShell and get a "command not found" error, it u...

Fix Windows Security Authentication Error 0x80070035

Windows Defender 502 Bad Gateway: Troubleshooting Checklist

If you see a 502 Bad Gateway error when opening Windows Security or trying to update Windows Defe...

How to Fix Windows Activation Error 0xc004c003 After Motherboard Swap

After replacing your motherboard, Windows may show activation error 0xc004c003. This means the ac...