That's interesting because I'm running an Intel 915 under Windows 7 and MY driver was obtained simply by running Windows Update -- and the current version I have (4.10.4764) is newer than the latest version shown in the Microsoft Update catalog.
Also, as others have TRIED to point out (repeatedly!) there is NO WDDM driver for this chipset. Period. The drivers are XPDM, meaning, they will NOT support Aero -- no matter how many hacks you try.