My Blackberry 7130e won't connect to Blackberry Desktop Manager because of a communication error

I am running Windows XP SP2. I have installed (several different times to be sure of clean installation) BB desktop manager. I connect my BB 7130e to the cpu via USB, and the desktop manager recognizes it, but when I click on anything it only says "communication error" and tells me to reconnect and try again. Nothing I have done has worked!!!! Please help!!
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