Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Activation 502 Bad Gateway Error
If you're trying to activate Windows and see a '502 Bad Gateway' error, it usually means somethin...
Fix Windows Terminal Authentication Failed in Remote Desktop
You open Windows Terminal, try to start a Remote Desktop session, and get an authentication faile...
Fix Chrome Profile Version Mismatch Errors
You open Chrome and see a message like “Your profile cannot be used because it is from a newer ve...
How to Fix Outlook Access Denied Error
You try to open Outlook and see an "Access Denied" message. This usually means Outlook can't read...
Chrome Shows Blank White Screen After Startup – Fixes to Try
You open Chrome, and instead of your homepage or new tab, you see a blank white screen. The brows...
Topic paths
Quick titles
BitLocker Update Stuck at 0%: How to FixTroubleshoot Outlook Version Mismatch with Exchange 2019How to Diagnose Windows Terminal High CPUFix Chrome Profile Download Error 0x80070005 on WindowsTask Scheduler Not Loading After Reboot FixTroubleshooting Outlook Authentication ErrorWindows Terminal Authentication Token Expired FixHow to Resolve 502 Bad Gateway in Chrome Profile