Problems with Aero

I have just installed Windows 7 and cannot preview the items in the taskbar as a result of the Aero tool not working. When I try to troubleshoot this i get the following error message -
"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 don't really understand, can someone please help me with this?

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