Hi! I know one things to two but this has never happened again! I did a format on my computer and reinstalled windows 7.they worked well untill they restarted with a high resolution. Yeah exactly. Every time windows update downloads nvidia drivers(gtx460) windows STUCKS at welcome screen. Actually it shows only welcome screen but you can use windows normally(I can hear the sounds and if you press ctrl+alt+delete you can actually restart or shut down) but you only see tha classic windows 7 wallpaper. I tried to start with f8 in safe mode or in low resolution mode and it works. But I want high resolution. Why doesn't it work on high resolution EVEN AFTER REFORMMATING 3 times?