The used keys: HKCU\Software\ falcosoft\DesktopMovie and if you enabled autostart: HKCU\Software\Microsoft\ Windows\CurrentVersion\Run\DesktopMovie Not specially Desktop Movie, but any program that uses hardware video overlay disables aero. It's designed this way by MS. The black window can be attributed to HW overlay, too. More about this (comment section): http://www.freewaregenius.com/play-full-length-videos-in-your-desktop-background-with-desktopmovie/
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