I just installed a 1st gen compatible 8800GT on my 1st gen Mac Pro. The appropriate drivers self-installed on OSX, but I have no clue how to get this card recognized by XP running on my Boot Camp partition. I tried downloading 167.44 as recommended by Apple at http://support.apple.com/kb/TS1442 but it wouldn't install. I downloaded 169.25 from Nvidia - likewise it won't install. In both cases it reports that "no drivers are found that are compatible with this hardware". Any ideas before I pop the 1900XT back in?