The Mobility Radeon 7500 does not support WDDM, so it will not allow the more advanced "glass" Aero interface in Vista. (Although you could force it to, see
www.tweakvista.com for details)\
Cards that don't support WDDM simply use the "XDDM" or the Windows XP display driver model. So you can use any driver in Vista (modded, or OEM) that you would normally use in XP. However you may need to "manually" install the driver through device manager if you run into software compatibility problems with the driver's "setup.exe" program.
Good luck, and take care.