
How to Reinstall the Windows Security App (Microsoft Defender)
If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...
Software troubleshooting desk

If the Windows Security app (Microsoft Defender) is missing, won’t open, or shows errors, reinsta...

You see an error like "A certificate chain could not be built" or "SSL certificate problem" when ...

You see a 'permission denied' message when trying to start or interact with the Windows Defender ...

When you try to run the Outlook offline installer on Windows 10, you might see a 'permission deni...

You open Chrome, click the extensions icon, and nothing shows up—or you get an error message like...

You click 'Check for updates' and get hit with 'Permission Denied' or 'Access Denied' – a common ...