I also have this video card. I have a Lenovo T60p with windows xp professional on it. But when I try to install this driver, it says that the setup could not find a driver for my device and exits.
I already have the right driver installed from before, but I am not sure if it is the latest. That's why I wanted to try and install the latest, but I don't think I should get this message if my driver is just already up to date.
Also, I have been having some blue screens during games with some message about some ati dll. (hence the reason I want to update my driver).