cbusen 36 Junior Poster in Training

I'm having a bear of a time installing the Sparkle graphics 9400gt pci in my PCI slot, i have no pcie slot( :( bigtime ). If i've read everything correctly, i need to uninstall everything existing, video drivers, video adapters, and all the related items and so on...and then install all the software. is that correct? keeping in mind i have an integrated video card and the computer will use that unless it detects something in the pci slot. do i need to uninstall the intel video controllers also? i'm really hoping that i did it wrong before and it isn't as slow as it tested out to be. any help or advice would be most appreciated. thanks. ps i've had no luck running fallout 3 and someother much less demanding games like civilization 4.

again thanks for anything