Fix 'Windows Defender Failed to Start Due to Group Policy' Error
You may see an error saying 'Windows Defender failed to start due to group policy' when trying to...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation Error 'Permission Denied' in Command Line
When you try to activate Windows using the command line (slmgr.vbs or slui.exe) and see 'Permissi...
Enable Windows Security Manually When It Fails to Start
If Windows Security (formerly Windows Defender) fails to start, you may see an error like "This a...
OneDrive Sync Proxy Error: Troubleshooting Checklist
If you see 'Proxy error' or 'Cannot sync' in OneDrive while connected through a corporate or home...
Fix Windows Defender Crash Loop in Windows 10
If Windows Defender keeps crashing and restarting on your Windows 10 PC—showing error messages, d...
Fix Windows 11 Search Not Showing Open Files
If you search for a file that you know is open in an app, but Windows 11 search doesn't show it, ...
Topic paths
Quick titles
Restore BitLocker After Windows Update FailureWindows Update Caused PowerShell Login Loop – Fix ItWindows Search Token Expired Error FixFix Windows Search on Mac Error 0x80070005Maven Dependency Resolution Permission Error GuideTroubleshoot Microsoft Store 0x80070005 Access DeniedRemote Desktop Module Missing – Easy FixTerminal Command Prompt Setup Guide for Mac