its not a test of the hardwair but a test of the driver all drivers for xp are tested and then approved.you can install an untested driver but windows will be very strict with the driver and if it causes a prob will deactivate it. it best to install this driver
Version: 40.72
Release Date: November 8, 2002
WHQL Certified
from this link till the new driver is certifed
http://www.nvidia.com/view.asp?IO=winxp-2k_archive