Screen going to funky colors and computer not shutting down!!!!!!!!

[440hsp]

ok guys, just watching a little youtube and all the sudden the screen goes to a bunch of pinks and blues. i could still see the picture of the video i was watching but it wouldn't let me get out of the page. i tried control,alt,delete, and escape and npthing. i had to shut it down using the power buttons. any ideas would be greatful. computer does come back on without issues as of right now. i updated my driver a while back to the newest nvidia driver. i wonder if that could be it. never had this problem before.

[440hsp]

Yeah i'll stick with 295.73 until i here from you guys on a more solid updated version.