from what i can find out on the web, you cannot upgrade the graphics on you laptop. are you sure that it also share's 128mb of system ram, as all info i can find states 64mb. upgrading ram will be pointless as well, if it only uses 64mb or 128mb system ram. 256mb system ram would be best but even then its all down to how good the graphics chip is.
to be honest, a new laptop or pc will be your best solution if you wish to play games but dont get budget models or you will have the same problems.