Oh yeah...Seems they didn't make a Vista driver even for that card. You're probably out of luck then, unless you can install the XP driver and it works. I doubt it but worth a try.
You'll have to install through the device manager if it will work at all, by pointing to the specific .inf.
You will not have Aero even if it does work.
Or another approach is to try to place an install string for your card into the
download from ATI/AMD's site for the 9500 Vista.
Right click on your standard vga in device manager. Properties. Details tab. Change dropdown to hardware ids. Copy and paste the results here, if you want me to make you an .inf for that ATI download. (x86 or x64?)