I recently installed windows 7 64-bit. Everything's running great except for when I play games. Certain games will for fairly long periods (hours of game play) while others will crash within an hour. The only games that I get to enjoy are League of Legends, Batman: arkham asylum, and Fable III, the last two happen to be microsoft games. Others such as, battlefield 3, FEAR, FEAR 2, metro 2033 and others always seem to crash on me. Can anyone help me out? The errors either say executable stopped working, atikmdag.sys bsod error, or IRQL not equal or less bsod errors.