This has been bothering me for quite a while now. All my ratings have been okay and as expected, but for some reason my desktop performance for Aero is always much lower rated than anything. Everything gets around a 5 (4.9-5.1) yet Aero performance either gets a 3.1 or 3.2. My GPU is a NVIDIA GeForce 8400M GS. I tried the test with 181.71 and 185.85 drivers installed, exact same results both times. Any idea why this could be happening (the low rating for Aero performance)?