Jack, it sounds like you might have a temperature issue...
You might try blowing a household fan into your "open" case directly onto your cards and processor to see if this is the problem...
Another thing that has been causing systems to crash lately is upgrading to the newer high end video cards (9700) and not having enough power supply. ATI recommends at least a 300w PSU, but if you are using an XP, or P4 processor, 300 watts is already bare minimum, heck 350 would probably be minimum on a system using XP, P4, AND a 9700.... You might want to check your PSU.
(I'm currently using a 340w PSU, but as soon as my 9700 arrives, a 500 w will replace it)
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