\\<servername>\<filepath>\Mindstorm\setup.exe \\<servername>\<filepath>\Mindstorm\bin\silent_install.txt /q /AcceptLicenses yes
What this does is set the compatibility layer on the setup.exe file to Windows Vista SP 2 and then uses the inbuilt silent install options and install Mindstorms NXT 1.1 Education silently (I have not tested this over UNC share, I will repost when I do).
More information can be found on the forum http://www.appdeploy.com/messageboards/fb.asp?m=81489
If you plan on packaging this software and using the USB interface with the robots rather than the Bluetooth in any large distribution, make sure to plug all of the robots into the computer you are using to package via USB and allow them to install once. This will allow the drivers to install for each robot as they all have unique ID's, and windows registers them as new devices. As such, non-admin users can not install the drivers if they plug in a different robot to the machine than what you used to package.