Hiho, this post is just for your info and to not let my research go to waste ... since last weekend I'm running Win7 64-bit. Up to now I'm quiet satisfied with look&feel and performance (not like Vista, which I uninstalled with two week ). New OS, new questions . My progam AMT utilizes MPlayer in the background, which automatically disables the Aero effect while running... on/off/on/off/on... not nice, so I searched for a way to disable Aero on programstart and came up with this fix: