
Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...
Software troubleshooting desk

If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

You try to sign in to Microsoft Teams and see an error like “Authentication failed” or “We couldn...

After a recent Windows or Office update, you might see a "Connection refused" error when trying t...

Outlook users sometimes see errors like "Cannot start Microsoft Outlook" or "The file C:\Users\.....

You try to activate Windows, but you get a message saying “Rate limit exceeded. Please tr...

You open Windows Terminal and get a version mismatch error—or something just doesn't work the sam...