
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 ...

If you've noticed Windows Terminal opening with old settings, displaying ghost profiles, or faili...

You're working in Chrome and suddenly a page shows 'module not found' or a script fails with a mo...

When you try to activate Windows using the command line—for example, running slmgr /ato

If your Windows Defender (Microsoft Defender Antivirus) scan is taking much longer than usual—som...

Windows Security (formerly Windows Defender) usually runs quietly in the background, but sometime...