
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 ...

When you try to activate Windows or reinstall it using a product key, you might see an error like...

When you try to open or download an app from the Microsoft Store on Windows 10, you might see a 4...

You try to start Windows Defender but get error 0x80070422: “The service cannot be started, eithe...

You click 'Check for updates' and see 'Downloading – 0%' for ten minutes or more. This is a commo...

You open Windows Defender Security Center and see "504 Gateway Timeout" or "Permission Denied" er...