i built a new system,asus sabertooth mobo, i 7 3.07 proc. 6 gigs of dominator ram, 6950 ati 2 gig graphics card,raptor 10000 rpm hd, games ran fine on win.xp 32 bit home edition.installed win 7 home edition 64 bit updated all driver with detective driver,system runs cool 43 degrees.all games crash at random times.10 min. to 1 hr game goes away and i have to cold boot system to turn it back on.and yes it was a fresh clean install and partitioned