After running Snappy driver update from a USB stick, something has gone wrong with booting my PC. When the machine starts, it reaches a point just before Windows is to boot, where a blinking cursor appears in the upper left corner, when this happens everything stops. When I activate the boot menu during startup and select my system drive, my PC boots normally. It seems as if Snappy has put some file on the machine, so something needs to be done before it proceeds to Windows startup. How do I get...