If nothing works:
If you see this error on a blue screen during startup, you may need a Windows 11 Installation Media on a USB drive. Boot from the USB and select . Go to Troubleshoot > Advanced options > Command Prompt . Run the following commands: bootrec /fixboot bootrec /rebuildbcd bcdboot C:\Windows /s C: /f UEFI 5. Reinstall Microsoft Security App error 0xc0e90002 windows 11