
Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

If Windows Search stops working and you see an SSL certificate error in the event logs or search ...

You may see an 'Access Denied' error when trying to open Windows Defender in Safe Mode. This typi...

If you rely on Outlook opening as soon as you log into Windows 7, having it fail to auto-start ca...

You type a command in Command Prompt and get '...' is not recognized as an internal or exte...

You try to unlock a BitLocker-protected network drive or access a recovery key from a network loc...