A couple
Are you using the latest drivers, directX
what are you system resources?
Have you checked your IRQs. Your AGP vid card should have it's own (11) If you add another card in the PCI slot next to the AGP slot you could be sharing resources. I always recommend keeping the slot next to the AGP slot open, unless you need all your PCI slots then you have no choice. But I would check the IRQs Nics like to use 11 and this could be your problem.
Good luck on fixing this
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Not so Rude,
RudeDog
