Please see
this page for how I figured out how to run Windows Vista on a Compaq R3000 laptop, including support for its graphics card,
Ati Mobility Radeon 9000 IGP. HP/Compaq no longer supports this system and ATI/AMD does not support the Mobility Radeon 9000 IGP graphics chipset, but I was able to scrap enough info together to get it to work well.