Ok ur all using geforce cards i had the exact same problem i think the patch or sumthin is real sensitive to
anti ailising so go to control pannel, display, settings, advanced, geforce(whatever card u got), additional properties, let it do whatever it whants to anti ailising, in direct3d settings tell it to only use 15 mb and in open gl settings tell it to use 5 mb.
now u may get choppy screens with sum games Battlefield 1942 but its just a case of turning the values back up