I was able to get opengl to work on it until I upgraded my system bios.
OpenGL still works when I boot up to NT4 on the computer.
Only GL demo i have been able to run is nVidia’s own nvTriStrip.
some of my system h/w:
AMD k6-2 500Mhz
Tyan S1590 w/VIA chipset
nVidia TNT2 M64 32MB
SB Live! value
Only things i still am trying are experiementing with all kinds of different drivers and messing with Bios settings.
windows registry might do it too, but not too sure about that.
First problem is that your working with the evil empire of Microsoft! 
I have heard from the happy people in IT here at Raytheon that Windows ME does not even Support many devices yet and they are working on posting the new drivers for them. Your graphics card may not be supported yet, but check the evil emipre’s(microsoft) webpage and see if they list any drivers for your card. That’s where I would start.
Hope this helps some. . . 
Roach