Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Defender High CPU Usage in Windows 10
If you notice your PC slowing down and the fan spinning up, Windows Defender might be using more ...
Fix Windows Activation Error 0x8007232b on Mac
If you see error 0x8007232b when trying to activate Windows on your Mac (via Boot Camp or a virtu...
Outlook Offline Installer Checklist for a New Computer
When setting up Outlook on a new computer, using the offline installer can avoid slow downloads a...
How to Enable Windows Security Backup Automatic Restore
If you've configured Windows Security Backup but find that automatic restore isn't kicking in aft...
How to Stop a systemd Service Restart Loop
You run systemctl status and see the service flipping between 'activating' and 'fail...
Topic paths
Quick titles
Windows Security Cache Clear Error: Permission Denied FixOneDrive Access Denied Error TroubleshootingResolve Windows Defender 404 Page Not Found in Windows 10Chrome 404 Profile Error After Update: How to FixWindows Update Throttle Error TroubleshootingFix Chrome ERR_TUNNEL_CONNECTION_FAILED ErrorFix SSL Protocol Error in Chrome for AndroidHow to Fix Windows Security Invalid Configuration Error