Radeon 7500???!? Wow.... That is some serious retro tech.
I think you are going to have significant problems running the game. Also the video memory may not be enough to cache all the things required...
the MAX amount it can address is 64 MB and it is a DirectX 7 card, with 0 vertex shader lines.
Functionally it is equivalent to a GeForce 4 Go card... Which would be an nvidia 4400ish series...
I have played this game with a nvidia 6150LE, and it was 1FPS Tops and you are using something 2 generations older than that...
I am betting you are on a laptop because you have a go card, but incase you are not, you can get an nvidia 7800 for 34$ us (AKA dinner for one at an ok restaurant) That would at least bring you to this decade for performance. nvidia 7800 is about the same as an ati X1600 series (11600 series)I think.