I have the same problem...I tested the computer with the trial version (before to buy it) and I have the same error.. No pirated version...
I have Winxp and Nvidia 8800 GT with the latest drivers... is there any way to solve this problem I would like to buy it, but with this trouble I ´m not really sure....
i know that with nvidia...sometimes it comes with accesories on the cd, mine came with some, and i had nothing but trouble until i 'uninstalled' the accessories.. after that everything worked great on my pc......strange but true. i have the same card as you 8800GT
if this is not your problem......is it possible to perhaps take a screenshot of the error you are recieveing? this might shed some light on the problem.......