Im playing Fallout 3 , im running gygabyte S-Series EP43-DS3 mobo , core2-duo 3.6 processor , asus nvidia ge-force 9800 GTX , 4 gig of ram, my whole computer freezes when i use the VAT system it works sometimes , its usually when i initiate VAT which is a weapons guidence system i think , people who play fallout3 will know, and sometimes on the occasion the whole game just freezes , any ideas ? it is not overclocked .