
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 ...

You click the Command Prompt shortcut or type cmd in the Run dialog, but nothing hap...

You're browsing in Chrome, and suddenly a page fails to load with the error ERR_TUNNEL_CO...

You click the new tab button (or press Ctrl+T) and Firefox freezes, goes white, or shows a spinni...

After a Windows 10 update, you might see an activation error like "We can't activate Windows on t...

When you run a command in Command Prompt and see invalid configuration permission denied