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 Outlook Error 0x80040600: Corrupt Data File
Outlook error 0x80040600 usually appears when you try to send or receive email. The error message...
Fix Docker Pull Access Denied: Reset Credentials
You run docker pull and get access denied. This usually means your stor...
Fix Chrome Extension Access Denied Error (Code)
You try to install or run a Chrome extension and get an "Access Denied" error wi...
Fix OneDrive Permission Denied When Syncing Files
You see a 'permission denied' error while syncing files in OneDrive. This usually happens when On...
Fix Windows Update 'Path Not Found' Error
When running Windows Update, you might see an error like 0x80070003 - Path Not Found...
Topic paths
Quick titles
Fix Windows Defender Blank Screen After UpdateSysadmin Guide to Fixing PowerShell Version ConflictsRemote Desktop Module Missing Error SolutionWindows Update Log Missing Fix GuideAutomatically Launch Chrome with a Specific Profile on BootChrome Profile Sync Error Troubleshooting GuideFix Windows Security Version Mismatch on Windows 10Fix Windows Security Network Error After Update