The night that I originally posted this, my screen began to distort and seemed to change back to Aero Basic. I opened SpeedFan and noticed that the GPU temp was beginning to rise quickly toward 60 C. I went ahead and shut the computer down. I was only browsing the web, listening to iTunes, and moving some photos around.
I also tried a friends GeForce 9600 in my machine instead of my card, but I could never get the driver to install. Upon reboot during the installation, it would lock up at the Windows logo screen.
I also tried running FurMark again on my graphics card. This time it made it for nearly 10 mins. without locking up and temp never exceeded 94 C.