The Nvidia video driver on my daughter's computer is continually getting corrupted in W8.1. Have re-installed it twice, but each time it only lasted a week. Now there is no screen at all. The supposed failover that Microsoft has developed to access UEFI [now that key strokes at boot are supposedly too slow], does not bring up the boot options menu. In fact it brings up nothing! Thus I cannot even boot from a flash drive. Anyone have a solution to this? Everything I have found on the web so far assumes the screen is working.