For no reason Firefox will no longer start up - no window opens

I have been using Firefox 4 for several days with no problem. For no reason this am Firefox will not open when I try to start the program. If looks like it is trying to open but no window ever appears. I tried uninstallling and reinstalling 4.0 and then installed 3.6 again but nothing has helped. IE browser works fine with no problems. I have no ideas left to try and get Firefox to work again. Any help would be appreciated.

Hello katielawrence, We're sorry to hear that your Firefox seems to be crashing. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.
#Enter about:crashes in the Firefox location bar (that's where you enter your website names) and press Enter. You should now see a list of submitted crash reports.
#Copy the most recent 5 report IDs that you see in the crash report window and paste them into your forum response.
Thanks in advance for your help!

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