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How do I get Firefox to open?

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I start my computer and I open Firefox by double clicking it, then the user menu comes up and I choose one and it comes up. But as soon as I close it and I repeat the process by opening it and choosing a user but it a window quickly pops up and closes and a crash menu comes up this keeps happening no matter how many times I try how do I fix this?

User Agent

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.125 Safari/533.4

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Also to add it wont even start the first time now please help me.