Office2007 ActiveD scripted install Issues

[diskgrunt]

I'm attempting to run our Office2007 ProPlus install via the network using actived that is issuing a startup script at the machine level via group policy.

The script is as such

"\\server\servershare\OFFICE12\setup.exe" /adminfile "\\server\server share\OFFICE12\Updates\OurCustom.MSP"

I've set the .msp to display minimal so I could see what was going on. The install starts as expected but then presents me with a navigation window in an attempt to locate part of the install

The exact message is

Setup cannot find Office.en-us\OfficeMUI.msi

So I'm a bit stuck. If I attempt to run the script manually on a system the install proceeds as expected. Any suggestions?