The Dell website provides a tip for NVIDIA overclocked video cards from the folks over at Battlefield 3 who realized that overclocking could cause havoc and crash the game – hence they have provided some easy steps to overcome this shortcoming:
Download the NVIDIA System Tools with ESA Support from here, go through the User’s Guide to know how to use the tool (this can be found in the Additional Information tab), and when the Tool is open, head on towards the Performance Device Manager, Select GPU and lower the slider bar down 10MHz. That ought to fix your problems…
The “fix” for overclocked cards is kind of obvious: try to de-overclock it and see what happens, and while this particular case is for NVIDIA cards, the same principle is valid for any other piece of hardware that is run beyond its initial specs. Good luck, and happy gaming.