From the pix u have uploaded, it seems you have not enabled Aero. To do it, Goto personalization and select a Aero theme and check. Also run the Windows Experience Index. Your computer should score 3 or higher so Aero can be enabled.
Also, goto personalization and in the bottom, if your computer doesnt support Aero i.e., your VGA is not WDDM compatible, you will see a Red X with some information. If this is the case, your computer is not eligible for Aero. My desktop has a older inbuilt VGA and the same issue occurs.
Also did you install the VGA drivers or Win 7 did it?
Check and revert.
Note: Before starting a new thread do a search too.