HELP Stack Overflow after using GLSetup with a Banshee

I ran Glsetup, it download what seemed the correct drivers for my Voodoo Banshee card. It rebooted, went back to 640 * 480 and 16 colours and wouldn’t change to bigger. So I reinstalled my old drivers. They installed ok, but after the restart I had to try and update the settings again so I go to restart again and I get a message just before windows starts up “Your program has caused a Stack Overflow”. So i can’t even use windows unless the res and stuff are in 640 and I the machine only starts every third try.