I have the diamond viper 550 agp and my system locks up while I am playing forsaken or motorhead. I had creative labs graphics blaster extreme and it locked up on myst and riven. I exchanged it for the viper. I have no problems with myst and riven but cannot even start forsaken. Motorhead will run but locks up during the first couple of laps. Can anyone help with reconfiguration or is this a driver problem? So far diamond multimedia has been no help.