PNY 6600GT issues with Gateway GT5056

OK, here's the issue. I was given this card by a friend of mine who told me it had been acting odd in his computer, so he just got a 9800GT. Originally I'd put this in my HP M7259C andd it worked as it should, albeit with only the Windows 7 supplied drivers. Now, I've replaced it with a 7300LE and wanted to move it to my son's Gateway. It will show video, but no aero and no driver updates will work. It sits at 1024x768 resoution and under device manager is listed as having "reported a problem" with the yellow triangle.

Anyone ever seen an issue like this and what can I do to get this card running on the Gateway?

EDIT...almost forgot to mention that this is a PCI-e card.
 
The yellow triangle means there is a driver issue. If you install the correct graphics driver and you still have this problem on your son's PC, the graphics card is likely defective. Consider it will have had a problem on three different PCs.
 
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