In Fusion, power down your virtual machine. Open the virtual machine library, select your machine and click "settings." Go to the video settings and enable DirectX/3D support. If available for your machine (i.e., you have a separate graphics adapter on your iMac or MB Pro and not integrated graphics (e.g., a MacBook or Air), you can select it. Click "apply" then click "OK." Then restart your virtual machine. When you restart, you should get it. I enabled this on my home iMac and MB Pro and got a message that said the support wouldn't necessarily work with everything. Since I use XP Pro and am not a gamer, I have not been able to test it on Aero or other 3D graphics.
Good luck!