
Fix Windows Defender High CPU Usage When Scan Stuck
If Windows Defender is using nearly 100% CPU and a scan appears stuck (e.g., progress bar frozen ...
Software troubleshooting desk

If Windows Defender is using nearly 100% CPU and a scan appears stuck (e.g., progress bar frozen ...

You've waited for the update to reach 100%, but it just sits there—not installing, not erroring. ...

You tried to download or update an app from the Microsoft Store, but got error code 0x80073cf0. T...

You open Windows Security but see only a blank white or gray screen. The interface fails to load,...

You download the Windows Security offline installer (the .cab or .psf file) to update Defender de...

You run a Windows Defender scan and it reports that a file is locked and can't be scanned. This i...