If the "Reinstall now" option is unavailable, repair Windows 11 using the ISO.
- Download Windows 11 Media Creation Tool (MCT) from this link:
https://go.microsoft.com/fwlink/?linkid=2156295 (MCT)
- Run MCT and download the ISO it recommends for your system.
- Right-click on the downloaded ISO and choose "Mount." This assigns the ISO a drive letter.
- Run setup.exe from the ISO drive.
This starts the repair installation.
(Your files, settings, and applications will be preserved if you use the ISO recommended for your system by the Media Creation Tool.)