Outlook plugin disabled

I am running an SG-125 UTM and want to setup the SFX encrypted email.  This is a test install on a user workstation with Windows 7 Pro and Outlook 2007 SP3.  I have checked the options on the UTM but am having problems with the Outlook plugin.

I have downloaded version 1.3.2 of the plugin through the UTM.  I have installed it both ways

- setup.exe

- SophosOutlookAddInSetupUTM.msi with T=3 EC=3 C=1 I=1

However, results have been the same.  When I start Outlook there are no encryption or spam features available.  If I open manage Outlook add-ins I see that the Sophos Outlook Add-in is there but not checked.  When I attempt to check the box to enable it I receive the message "the add-in is installed for all users on this computer, and can only be connected or disconnected by an administrator."

I have installed with "run as administrator", installed when logged in as an administrator - even temporarily made this user account a domain admin - same results.  Anybody have ideas on how to resolve this and move forward with my testing?

I have support but I have waited on the phone for 30 minutes and decided to give the forum a try.  Thanks.