I just bought this card,after installing it it would run perfectly for about an hour,then the computer freezes,and in gameplay I get the weirdest lagg.I already uninstalled the old one which was a Geforce 5200.this card is suppose to help fix my freeze and lagg problems but it worsens it,any suggestions?Specs are-AMD 64 3400 processor,RAM 512mb,200gb harddrive 7200 rpm,Nvidia Geforce 6200 turbo cache