
Troubleshooting
Reset Windows Defender Service to Default Settings
If Windows Defender isn't starting, showing errors, or acting strangely, the service settings may...
Clear technical guides for everyday software errors, configuration problems, and productivity tools.

If Windows Defender isn't starting, showing errors, or acting strangely, the service settings may...

You double-click a file in 7-Zip and get "Cannot open file as archive." But you know the file is ...

If Outlook stops syncing with your Exchange Server, you’ll likely see errors like “Disconnected” ...

You type MpCmdRun.exe -Scan -ScanType 2 or another Defender command in Command Promp...

You open Chrome on your Mac and see a warning like “Your connection is not private” or “NET::ERR_...

You buy an app on one Windows PC, but it doesn't show up on another. Or your game saves, settings...
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