Office 2007 Professional (from the Launch 'party')

Ok, I received a copy of Microsoft Office 2007 Professional from the Windows
Vista / Office 2007 launch in late Dec. 2006. Recently, however, the key
that came with my software, shows it as an "Enterprise" version, and I can't
install any of the updates.

Any reason for this, or how can I get this fixed?

Thanks, Allan