Can not start Thunderbird. Says already running, even after a re-boot.

Today is Wednesday, June 24, 2009. I tried to start Thunderbird today and it said that I already have a session open. It said to restart Windows. I did that and it still will not let me start Thunderbird. I looked at the task manager and at the processes running and I do not have Thunderbird running. Can you tell me what is wrong and how do I get Thunderbird back up?
 
sad I’m confused
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