Nope. Intel 915G motherboard chipset doesn't support Windows 7 or Vista. So ther are no drivers for it. By default windows 7 installs a VGA Adapter driver, but performance is not good. So stick with Windows XP.
But you can try this:
Modded Driver has the 852-865g and the 915 Drivers. All latest core files for the driver (ialmnt5.sys) have been acquired through Windows Vista Drivers. As Intel had given up making new dirvers for these controllers ages ago, this is the latest compatible diver. This one should work well on a 915. It is really recommended if you have an 8xx series or a 915/910 Controller as it can really boost performance.
Also added to really increase performance for 910/915 Controller is that this 915 driver is compatible with the following release of GMA Booster. This will really boost gaming. It took quite some time to find a working release and driver but they both are now combined. Cheers!!