Seems either a re-installation of windows or a backup of your boot partition is the next step. What in such cases at times also helped me out is using Tweaking.com 's Windows AIO Repair. (there's a portable version available). Run that in safe mode (you can choose to do that from the main menu). Also check all basics like SFC (via Windows Repair), and via a command sript, (running as administrator) DISM maybe too, searching for window's corrupted files. See: command scripts . - F