Even after following the guide, you may encounter issues. Here is the troubleshooting bible for the GMA 3100 on Windows 7 64-bit.
Less reliable, but worth a try:
Since the installer will block you ("OS not supported"), you must install it manually via Device Manager: intel gma 3100 driver windows 7 64-bit
Reboot. You should now have full resolution and Aero Glass. Even after following the guide, you may encounter issues