vCloud Director depends on VMware Tools to customize the guest OS.
VMware Tools improves management and performance of the virtual machine by replacing generic operating system drivers with VMware drivers tuned for virtual hardware. You install VMware Tools into the guest operating system. Although the guest operating system can run without VMware Tools, you loose important features and convenience.
The virtual machine must be powered on.
If your newly created virtual machine has no guest operating system, you must install it before you can install VMware Tools.
Guest customization must be disabled prior to installing VMware Tools.