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 listWindows Terminal 504 Error: Step-by-Step Troubleshooting Checklist
Seeing a 504 error in Windows Terminal usually means a gateway timeout when trying to reach a rem...
Fix Microsoft Store Not Opening with wsreset Command
When the Microsoft Store refuses to open—either it crashes on launch, hangs on a blank screen, or...
Windows Defender Command Not Found in PowerShell: Fixes
When you type Get-MpComputerStatus or other Defender cmdlets in PowerShell and see <...
Fix PowerShell Network Drive Access Denied Errors
You try to map a network drive in PowerShell, but get 'access denied'. This is common when permis...
Fix OneDrive Sync Unavailable After Update
After a recent Windows or Office update, you might see “OneDrive sync is unavailable” or the sync...
Topic paths
Quick titles
Troubleshoot OneDrive Error 0x8004de40 on WindowsHow to Resolve Certbot Nginx Plugin Permission ErrorsFix Windows Update Stuck at Blank Screen During Automatic Repairslmgr Fix for Windows Version Mismatch ErrorTroubleshoot Chrome Profile Connection RefusedPermission Denied Login Loop in Windows FixPermission Denied in Windows Security? Here's How to FixPowerShell to Azure AD Sync Error Guide