Quicktime

Below a "truly silent" method, taken from http://www.mediamacros.com/item/item-1006687115/:

How do I make Quicktime Install Silently?

First you need the stand alone installer from Quicktime. Then place a text file beside the installer and name it QuickTimeInstaller.ini and place this text inside....

[QTSETUP]
license_option=0
no_dialogs=true
registration_dialog=false
supress_speed_dialog=true
install_qtjava=false
install_qd3d=true
show_sample=false
show_readme=false
show_programfolder=false
install_qtinfo=true