Updater is disabled on (Win Xp, Vista UAC Off, Win7 UAC Off) with Non admin user a/c. If the machines on which you want the updates to be applied, do not fall under the above mentioned config then you can use the following HKLM registry key to be set on the machine,
Windows Registry Editor Version 5.00
You can use the "reg" command to set the registry from the command line.
I usually run AdobeUpdater.exe from Program Files\Common Files\Adobe\Updater5 to do that. (The folder can also be Updater6, depending on your installed Adobe Products.)