Fix Windows Defender Not Opening Error 404
You try to open Windows Defender and get an error 404 – the page or resource can't be found. This...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Error 0x800f081f with Windows Update Cleanup Tool
If you see error 0x800f081f while running the Windows Update Cleanup Tool (part of Disk Cleanup),...
How to Fix Windows Update Error 0x80070002
When you see error 0x80070002 while running Windows Update, it usually means the update files are...
Chrome Profile Cannot Connect to Extensions: Fixes
You open Chrome and notice extensions are grayed out or show a 'Cannot connect to extensions' err...
Fix Outlook Error 0x800ccc0d: Network Connection Problems
Outlook error 0x800ccc0d typically appears when sending or receiving email, often due to a networ...
How to Fix Windows Update 404 Not Found Error
When Windows Update returns a 404 Not Found error, it usually means the update server can't locat...
Topic paths
Quick titles
Troubleshoot Windows Security Not LoadingFix Paused Windows Search IndexingHow to Fix Windows Security Real-Time Protection Not Turning OnFix Windows Security 'Failed to Start' Group Policy ErrorTroubleshoot OBS Virtual Camera Audio DelayFind PowerShell Log File Location Using CommandsTroubleshooting Missing PowerShell CommandsHow to Recover Deleted Scheduled Tasks