Pci e drivers?

Hello, im having a problem and i was wondering if anyone could help,i need the driver to help my mobo read pci e better,for a graphics card,ever since i installed it im having really slow post,the graphics card is a geforce 210(512mb) and my mobo is a via chipset,p4m900, cpu is intel celeron d 2.66 ghz, running xp home,with 2 gigs of ram

even if it wont fix it id like to find out which driver is specifically for cards,and perhaps the right settings i should be putting in bios

oh i think its phoenix 6.00