Deploying Office 2007 through SMS2003 - Silent Install not working

Hi guys.
I am trying to deploy Office2007 through SMS using silent install, but still
end up seeing the "Upgrade/Customize" screen.
I've run the setup.exe /admin on the source server, created an .MSP and
saved it in the Updates directory. In the MSP I've given our MLV 25 digit
key, agreed terms & conditions, set the display level to 'none', completion
notice unchecked, suppress modal and no cancel checked. In SMS, in the
Package - Program - Environtment settings, I've set the program to run with
Admin Rights, and set "Allow Users to Interact" checked (turning this off
means I seem to see nothing on the client machine even though it says it's
running!).
How the devil do I force MSO2007 to just either upgrade or install without
user intevention at all!
Thanks
Dave
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Dave Parker
ESYS PLC
(http://www.esys.co.uk)