Problem with preview in taskbar

[eewo]

Recently (i assume after update - maybee graphic card driver or something else) I am not able to see preview screen of minimized window in taskbar. There is only list with open windows.

I have attached picture to make it clearer.

Tnx in advance

 

[Thrax]

Aero is not enabled on your machine. The window preview is only available when Aero is running. Update your graphics card driver and re-run the Windows Experience Index.