On Windows 11, you can use the Microsoft Defender Antivirus to scan individual files and folders to make sure they are not infected, and I'll show you four methods.

Corrupt Windows Defender system files: The system files or core files of Windows Security may be corrupt, and hence it cannot start the offline scan.

Hence, if the scenario is applicable, you can run Windows inbuilt tool called System File Checker (SFC) to fix damaged system files. SFC scan is usually run through Command Prompt.

It can take a while for the System File Checker to scan your machine and to make any necessary repairs. When the process completes, you should see an indication of whether or not the System File ...

These aren't like your chipset or graphics drivers where you can (and should) update them yourself, but fortunately, Windows has a built-in scan tool to help fix file system and Windows driver errors.

Click "Scan for Viruses" and then double-click "Scan My Computer" to perform a virus scan on the PC. Norton AntiVirus will automatically remove any detected infections.

Click on the "Clean Up System Files" button to scan for system files that are no longer necessary. Check the box next to the "Temporary Files" and "Temporary Internet Files" heading under the Disk ...