Well, if you can get a Geforce 2 MX for free (like, the old one from a friend), that will do too, but won't look nice. But the game would at least work and play with acceptable fps - at 640x480 and with everything turned down (the "Low" button in the menu).
Try anyway to get good drivers for your SiS - maybe the ones you have just don't support OpenGL at all, and you need some that do. But don't expect too much, it probably won't work.