

These files can sometimes prevent you from running the Windows Defender. Using the Uninstall option from the Control Panel, it is possible that some files won’t get deleted and are still present in your PC.

When you uninstall third-party antivirus solutions using the Uninstall option from the Control Panel, it’s possible that some files remain undetected and this prevents you from running Windows Defender. FAQ Use antivirus specific removal tools.Set Windows Defender Service to Automatic.
