How to Fix Windows Update Error 404 Not Found
You see error 404 when checking for updates in Windows Update. This usually means the update serv...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Microsoft Store Connection Refused After Update
After a Windows update, some users see a 'connection refused' error when opening Microsoft Store....
Chrome Connection Timeout Checklist: Diagnose & Fix
You open Chrome, try to load a site, and get "This site can’t be reached" or "Connection timed ou...
Fix Windows Security Center Version Mismatch Errors
You open Windows Security and see a message about a version mismatch, or the Security Center serv...
Fix Windows Update High CPU Usage and Service Not Responding
If Windows Update is consuming high CPU and the service stops responding, your system may become ...
How to Fix Windows Security Access Denied on Startup
If you see an "Access Denied" error when Windows Security tries to open at startup, the antivirus...
Topic paths
Quick titles
How to Fix OneDrive Sync Service Unavailable ErrorTask Scheduler Port 80 Already in Use FixMicrosoft Teams CLI Missing After Update – Quick FixRun a PowerShell Script Without Changing Execution PolicyCreate React App Node Version FixHow to Fix BitLocker Service Unavailable ErrorBitLocker Service Unavailable Permission Denied Fix GuideWindows Activation 502 Error Fix Guide