Unable to change graphic settings

Hi there,

The default graphics seem to be slightly too high as the game runs extremely slowly in 3D race. However, whenever I try to change the settings I get this message:

"The graphics auto-configuration utility was unable to identify your video card. Default settings were applied, but these may be changed via the Options page."

And the settings do not change. Can you please help me to resolve this?

Many thanks,
Tom