hello, i'm sorry to hear that u're having problem with the game.
if it's alright with u, can u let me know what version of NVidia driver that u've downloaded & install. i also have problems with 2 of my geforce2 mx200 cards at work, which were identified wrongly as quadro.
what i did was to force windows to accept the new drivers, even with warnings.
may i know what operating system as well as RAM size that your system has? someone has mentioned that u need at least 512MB of RAM for the game to run without much hitch. very unrealistic, i know, but until more step up to confirm/refute this, i cannot say more.