Did you install latest proper display driver for your VGA/GPU? Also if you haven't removed Aero, as I see you didn't, you shouldn't have tampered with any tweaks around it, just go in the Desktop Properties and select Aero Glass, you have to select it if WinSAT is removed, it won't do it automatically, that's the only difference. Otherwise if there is no Glass on the list then it's either the wrong tweak or wrong display driver. Note: Glass is not in the Themes page, it is in the Windows Color and Appearances in the Desktop properties (Personalize).