Eror console 203

Hi,
I have tried everything to install zotero; however, I keep getting the "console error 203". I have looked up ways to correct this, including installing regcure, and nothing works. Does anyone know how to fix this error so that I can install zotero?

Thanks,

Firefox could not install the file at

http://www.zotero.org/download/zotero-1.0.10.xpi

because: Unexpected installation error
Review the Error Console log for more details.
-203
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