[Edi]

There is not necessarily any problem with the graphics card itself. If you're running Windows XP with native drivers, no wonder you have it slow, because those drivers do not support OpenGL. You need to update the drivers with the manufacturer's own instead of Micro**** ones, and then you also probably need to run a program called Refresh Force to take care of the refresh rate synching. That should fix things.

My own rig is a Celeron 500 one, five years old, and no problems running Dom2 as long as the detail is set to lowest.

You should find the thread where I wrestled with the same problem by running a forum search about display problems. It has all the links you need.

Edi