A couple of suggestions.
Do you have another AGP card that you can test the AGP bus on your motherboard.
In your bois, try changing your AGP speed from 4x to 2x. This isnt a solution, but I believe when you instal nVidia divers it enables 4x, and this may be why your card functioned before the driver instal.
Download the latest drivers from Nvidia.com.
Have you installed the Nforce2 drivers for the motherboard. These include AGP bus drivers.
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