Windows Defender Troubleshooting Checklist
Windows Defender (now Microsoft Defender Antivirus) usually runs quietly in the background, but s...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation 504 Gateway Timeout Error
You try to activate Windows, but get a '504 Gateway Timeout' error. This usually means the activa...
Fix Windows Security High CPU Usage on Windows 10
If your Windows 10 PC is running slow and Task Manager shows Windows Security (or Antimalware Ser...
How to Reset Windows Search Using Command Prompt
If Windows Search stops returning results, takes too long, or shows errors, resetting the search ...
Fix Windows Update Stuck at Blank Screen During Automatic Repair
You're running Windows Update, and after a restart, the screen goes blank—no cursor, no logo, jus...
Fix OneDrive Sync Error 0x8004de40 (SSL Certificate)
If you see error 0x8004de40 when syncing OneDrive, it usually means your computer cannot verify t...
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