We will get to that if its the problem. I did a quick google search and found out alot of people using SLI cards ran into a simple problem. When you update your card drivers Nvidia Control pannel turns off SLI. Check to make sure that your cards are set to SLI. Some people aso set one card to PhysX thinking it was SLI. so check the setting's in Controll pannel.
In the Nvidia control panel, GTX570(1) is selected in the PhysX option but the box for dedicating that card to PhysX is not checked. Should I change that to auto-select?