Install Citrix Delivery Controller 7.6 from the Command Line
Again…installing things manually is sort of dumb IMHO. That´s the commandline for the installation:
XenDesktopServerSetup.exe /quiet /components controller /nosql
Additional command-line parameters can be found here: http://support.citrix.com/proddocs/topic/xenapp-xendesktop-76/xad-install-command.html