Opengl used to work but doesn't now

Opengl was working perfectly but then i reformatted my comp. I installed Jedi2 : Jedi outcast and when i start it up it says could not open opengl subsystem. I tried to install the newest display driver for My Ati rage 128 pro and it says the driver isn’t compatible with my display adaptor. What do i do now, should i take this up with ati instead of u guys?