0x8000FFFF
An unexpected failure. It sounds worse than it is; it shows up with System Restore, the Store and updates.
How to fix it
- Restart the PC.
- Open Command Prompt as administrator (search "cmd", right-click, Run as administrator).
- Run:
DISM /Online /Cleanup-Image /RestoreHealthand wait for it to finish (it can sit at 20% for a while). - Then run:
sfc /scannow - Restart the PC.
Is it serious?
Usually software.