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Welcome, Ted.
Tiber has made an excellent point about the power supply, and I highly recommend you read the thread he mentioned. If you can get access to a high quality unit (such as Enermax, Antec, OCZ, Silverstone, Seasonic, FSP) in the range of 500W+, stick it in your system and give it a go.
As Tiber said, double-check that you don't have any background tasks running - some common ones are listed in the sticky thread. Also read the NVIDIA Drivers thread Tiber linked, and make sure you're using the 84.21's, as bad drivers sometimes cause the problem you're describing.
It may be a heat problem, so install Everest, and then take a look under Computer -> Sensor. Record the temperatures and voltages, both when the system is idle (at the desktop) and when under load (after 15 minutes or more in a game). Post that info here, and we'll take a look.
EDIT: Fr4665 beat me to the draw again!
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