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

Fix Windows Defender Module Not Found After Antivirus Uninstall

After uninstalling a third-party antivirus program, Windows Defender may fail to load its modules...

Fix Microsoft Teams Port Already Allocated Error

You launch Microsoft Teams and see an error: 'port already allocated'. This usually means another...

Fixing Microsoft Teams Rate Limit Error When Sending Messages

Fix Task Scheduler Blank Screen After Windows Update

After a recent Windows update, you open Task Scheduler and see nothing but a blank white window. ...

Fix PowerShell Token Expired Error 401

If you're seeing a 401 status code with a message like "token expired" in PowerShell, it usually ...

Fix Ubuntu APT Update GPG Error: No Public Key

When running sudo apt update, you might see errors like NO_PUBKEY 1234567890AB...