Error starting Zotero

I have recently installed Mozilla Firefox 6 onto a Windows computer. I tried to add-on the latest version of Zotero (2.1.8). I can log-in to see my library fine, but I want to install zotero on this new computer and sync my library to it.

When I try to open zotero there is a triangular yellow exclamation mark and an error bar opens saying:

There was an error starting zotero.

I've tried restarting everything but nothing changes. What can I do?

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