VGA Graphics Adapter Update

Hello, I have an IBM T30 laptop and when I try to play online games I get the following message " Graphics card not supported " or some such thing,it also says to update my Video card. I go to Windows update and I can't get an update for it,then I go to Control panel and go to device mngr.and when I click update it comes back with " your equipment is up to date". I don't understand. I have n ATI Mobility Radeon 7500,8 bit,adapter string:VGA,Bios information:01.00,Total Average Memory:16320,Dedicated Video Memory:n/a,System Video Memory:n/a,Shared system Memory:n/a,and I really can't pay for an upgrade,so I need a free driver update. Where can I get it and CAN I get it!Please?...Help. Thank you.