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.
1. Open Notepad
2. Paste: ÿþMSMSMS
3. Save
4. Open the file in Notepad again
You can vary the number of "MS", so you can clearly see it's MS which is causing it.