Náhled Aero je stejně něco jiného, tím bys Aero nezapnul. Tohle máš správně nastavené?

Windows needs to be activated.
You must be have True Color (32 bit) set instead of High Color (16 bit).
The Desktop Window Manager Session Manager and Themes Services need to be set to Start and Automatic.
The desktop composition and Animate controls and elements inside windows options enabled in Visual Effects.