Check to see if there are any newer drivers available for that graphics card.
Other than that you'd have to try running in software rendering with the r_allowSoftwareGL "1" command in your config file.
Probably be far better off getting a new graphics card though.
Another thing you might look into is making sure that you have an up to date DirectX
else
open
http://www.glsetup.com/
and download latest OpenGL



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... we just need some extra details to effectively help you 
