Vista to XP downgradeFollow

So I got tired of whining about how much I hate Vista and went back to XP. I had some driver troubles, however, since the hardware was meant to be Vista compliant and isn't immediately available on Windows update. And I'm having trouble find the right drivers from the Intarwebbs.

The motherboard is a Nettle2 with an nVidia chipset. I'm missing the USB 2.0 drivers. (After some digging I found the nVidia chipset driver, but for some reason the USB stuff wasn't included with that.)

Does anyone have any idea how the hell I can find the appropriate high speed USB drivers? x_x