Hi Wouter368,
I'm sorry to hear that the power menu options are gone, I'll be happy to provide you some steps that could resolve this issue.
- Press Windows + X and select Command Prompt (Admin)
- type this and enter:
sfc /scannow - type this and enter:
DISM /Online /Cleanup-Image /RestoreHealth - Restart the device: Since there is no way to restart using the power menu, just copy and paste this command using the same Command Prompt:
shutdown /r -t 5
If that did not solve the issue, just reply back so I can provide the next steps.
~ Lee