Dear njs@softsquad
Thank you for posting in the Microsoft Community。
This is a file image corruption of XBOX,
we suggest you to press WIN+S to search for CMD - right-click - Run as administrator.
SFC /SCANNOW
DISM.exe /Online /Cleanup-image /Restorehealth
If the above steps do not work, it is still recommended that you exit S-mode.
Then download the windows 11 installation media to repair the installation.
https://www.microsoft.com/en-us/software-download/windows11 Select Download Tool Now - Run - Accept - Select Create Media Tool for another computer - Select DVD ISO file - Save as Desktop - Select ISO file on desktop - Right click - Mount - Run SETUP.EXE
I look forward to your further reply.
I hope the above information can help you.
Best Wish
Shawn Z | Microsoft Community Support Specialist