
Fix Windows Security Loading Issue with Built-In Repair Tools
If Windows Security (formerly Windows Defender) won't open or gets stuck on a loading screen, the...
Software troubleshooting desk

If Windows Security (formerly Windows Defender) won't open or gets stuck on a loading screen, the...

You click to open Windows Defender Security Center and see a 404 page, or the Settings app shows ...

After upgrading Windows—whether from an older version or a feature update—you might see an error ...

When you try to back up files using Windows Security (Windows Defender) or the built-in backup to...

If you use Outlook with add-ins, scripts, or third-party integrations, you might see an error lik...

If the Microsoft Store won't load, apps fail to download, or updates get stuck, a corrupted cache...