Don't listen to these guys, they're just messing with you. <A HREF="http://www.ati.com/support/drivers/winxp/radeonwdm-xp.html?type=xp&prodType=graphic&prod=productsXPdriver&submit.x=15&submit.y=5" target="_new">Catalyst</A> is the driver of choice for the 6800GT, everybody knows that. If you look around, you'll notice that a lot of people are using them.
Athlon 2500+, Asus A7N8X Deluxe Rev2, 768Mb Corsair XMS 5-2-2-2.5, Sapphire 9800 Pro 128Mb, Seagate SATA 80Gb, Fortron-Source FSP400-60PFN