oh gee, i am SO sorry, flib.
unfortunately, you're below spec for running the game. between the cpu and the voodoo, there's not much to do, but try to find the best, DX8.1 drivers you can and run everything at the lowest settings.
are you able to even run 32bit with the voodoo?
i'm surprised that you can run the game. but i can see how the Editor would totally freak out over your system. it needs to be able to work efficiently, and even if you could get those textures and items out to work on, i think your render times would be phenomenal (translate to loooooong wait times between each action).
V***V