game not responding

i play GW for 10-15 m,ins then the monitor shuts off and i have to hit (ctrl+alt+delete) to exit the game and in the task manager screne it says GW is not responding..this problem just recently occured ..ive had the game for a little less then a month and it started about a week ago..ive even formated my entire computer and reinstalled EVERYTHING and still the same problem..got any ideas??

Maybe it's virus/spyware? I had a game that would freeze mid-game if I had any sort of spyware or virus. Now my computer is 100% clean. No re-formatting needed either.

i just formated it and installed norton 2005 antivirus and microsoft anti spyware and it says im clean