Edit 2026-01-09: Added Windows 11
Window 10/11 Errors including weird boot error codes, start menu not appearing when clicked, crashes when opening windows settings or office / IE / Edge (All the programs that shared code with the OS but really shouldn’t)
Don’t know exactly what they do or how long they will take but they usually work if you run one after the other in this order at an admin cmdline
DISM /Online /Cleanup-Image /RestoreHealth
sfc /scannow