I have a Sony VAIO laptop SVE15111EN with Windows 7 Ultimate 32-bit running. The Aero themes are not activated. The troubleshooter says
The current video card may support Aero with a driver that is compliant with the Windows Display Driver Model (WDDM). Contact the manufacturer of your computer or video card for a WDDM-compatible driver.
I can't find any relevant driver for Windows 7 Ultimate 32-bit for my laptop.