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 Docker Container Restarting with Permission Denied
When a Docker container restarts repeatedly with a "permission denied" error, the problem often l...
Fix OneDrive Sync Settings That Reset After Update
After a Windows or Office update, you might notice that your OneDrive sync settings have reverted...
Force Delete a Locked File in Windows Using Command Prompt
When a file is locked by a program, Windows prevents deletion with errors like "The action can't ...
Fix Command Prompt Update Configuration Error
You open Command Prompt and see an error about an update configuration problem. This usually happ...
Task Scheduler Task Not Running on Startup: Permissions Fix
You set a task in Task Scheduler to run at startup, but it never does. The task shows as ready, b...
Topic paths
Quick titles
How to Start Windows Defender Threat ServiceWindows Search High CPU Fix When Not IndexingFix Windows Update High CPU Usage with These ToolsOneDrive Proxy Sync Troubleshooting GuideTroubleshooting Windows Update Error 0x80070005Fix Windows Update Invalid Configuration ErrorOutlook Not Receiving Emails: Troubleshooting ChecklistHow to Turn On Microsoft Store Startup in Settings