NVIDIA Display Driver crashes every time I try to play games

I just disabled Aero and adjusted my power settings in Windows 7 to disable power saving for PCIe, and I made it though one of the long test chambers in Portal without it freezing up! But then it started freezing up much more often again once it first froze up after I started playing...

It's like everything I do helps slow down the error so it doesn't happen as soon, but then it will always eventually happen.

Any more suggestions?

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