Problem installing Word plugin for non-admin user on Vista

digitig

I can install the Word plugin for the Vista administrator just fine, but if I try to install as a non-administrator (supplying the admin password when requested) the addins tab doesn't appear on the Word 2007 ribbon. Is it possible for non-admin uers to use the Zotero Word plugin on Vista? If so, how do I set it up? For what it's worth, when running the installation package the files seem to unpack to a directory that had nothing to do with the user I was logged in as.

Thanks in advance.