I've got a 2002 Gateway desktop w/Pentium 4. I've got a NVIDia GeForce T4 4200 card, but need to upgrade. My fear is that I will purchase the wrong board and not be able to send it back...and of course I would like it now. LOL I know that the computer doesn't have a PCI-E slot, but has PCI slots. can I upgrade to any board that has a PCI slot? I think the NVIDia 4200 I have was in a "AGP" slot..does that sound right? So if I wanted to upgrade to a Nvidia Geforce 6600GT 6600 GT 512MB AGP Video Card would it fit my computer?