I had Pinnacle Studio HD Ultimate 15 installed with Windows 7 and it was working fine. At some point last year, every time I would start Studio, Windows Installer would open and try to complete the installation of Studio, which had been opening with no issues prior to this. UAC asks for permission to open Windows Installer and if I say no, Studio opens right up with no problems. I recently upgraded Windows 7 to Windows 8 and hoped that this might repair the Studio/Installer problem, which it didn't. I even uninstalled and reinstalled Studio, but the problem still exists. Does anyone know how I can fix this?