Fix Windows Defender Service Not Starting (Error 404)
If you see error 404 when trying to start Windows Defender, it usually means the service executab...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix 'Module Not Found' Error for Microsoft Teams on Mac
If you're seeing a 'module not found' error when launching Microsoft Teams on your Mac, the app l...
Fix 'Access Denied' Error When Using Net User in Command Prompt
When you run the net user command in Command Prompt and see an 'Access Denied' messa...
Fix Windows Defender Missing After Update
After a Windows update, some users find that Windows Defender is missing from the system tray, Se...
Fix Chrome Profile SSL Certificate Error Not Working
You're browsing in Chrome and suddenly get a persistent SSL certificate error—even on sites you k...
Fix Chrome Profile Authentication Failed Error
You open Chrome and see "Profile authentication failed" or "Sign in to y...
Topic paths
Quick titles
Command Prompt SSL Certificate Problem SolvedFileZilla FTP Connection Timeout Setup GuideHow to Fix Stuck Visual Studio Installer DownloadFix BitLocker Drive Encryption Hanging at 0 PercentGit Repository Not Found: Practical Troubleshooting ChecklistMicrosoft Store CPU Spike Troubleshooting GuideTask Scheduler Error 0x1 TroubleshootingBitLocker 404 Not Found: Configuration Checklist