Unable to find Zotero Toolbar or insert citations

I've been working on my document for a few months on a Mac (Mac OS X Version 10.6.8) using Word (2011). I'm using Zotero (3.0.8) and Word Plug in for Mac (3.5.5). Things have been going smoothly. But today i loaded Zotero and the Word Plug in on an older PC (i don't have the specs, it's at school). I was unable to add citations there, so i came home to add them.

When i first opened the document, the Zotero toolbar was where i left it, but it did not work. I clicked "add citation" but nothing happened. When i closed Word, i received an error message "Word could not fire command."

I uninstalled both Zotero and the plug in and re-installed them both (with Word closed). I then went to add the toolbar, but there was no option to do that. I then used the Help function to "Add Citation" and received an error (OSStatus error -1708).

This is my dissertation, so you can imagine i'm a bit panicked... thoughts?
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