How to Fix Windows Security 404 Not Found Error
If you see a '404 Not Found' error when opening Windows Security (formerly Windows Defender), the...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Security High Memory Usage
You open Task Manager and see Windows Security (or Antimalware Service Executable) using 500 MB o...
How to Fix Remote Desktop Authentication Errors
You try to connect via Remote Desktop and see an error like "An authentication error has occurred...
Fix Windows Search Indexing Paused in Windows 10
You open File Explorer or Start menu and search returns no results. Or you check the indexing sta...
Fix Microsoft Teams Authentication Failed Due to Proxy
If you see 'Authentication failed' when launching Microsoft Teams and you're behind a corporate p...
Checklist for Fixing Command Prompt Startup Issues
If Command Prompt won't open, closes immediately, or shows an error on startup, the cause is ofte...
Topic paths
Quick titles
Windows Terminal Profile 404 Error FixExternal Drive BitLocker Path Error TroubleshootingMicrosoft Store Connection Refused Troubleshooting ChecklistWindows Terminal Sync Not Working? Try These FixesHow to Fix Access Denied Error in Windows SecurityTroubleshoot Windows Defender Offline Scan ProblemsWindows Terminal Start Menu Icon Missing: TroubleshootHow to Fix Windows Defender Service Dependency Error