Zotero does not start in Firefox 3.6.6

Hi,
I just installed the latest version in Firefox 3.6.6/WInXP. I can see the menu Extras/Zotero and the "zotero" icon on the bottom right.
I can go to the zotero options via the extension manager.
But when I click on Extras/Zotero or the icon, nothing happens.
Uninstalling and reinstalling didn't help.
regards,
Bernhard
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