What about Quicktime 6.5.1? I've done a search here and on google and can't find a silent install switch except creating a QuickTimeInstaller.ini file that you place with the full installer. Will this work if I include this app in GuiRunOnce section of my unattend file? Thanks. Never mind, here's what I did: ECHO. ECHO Installing QuickTime 6.5.1 ECHO Please wait... start /wait %systemdrive%\aig\apps\quicktime\QuickTimeFullInstaller.exe /qn I kept the .ini file with the full installer and it installed silently at startup.