Firefox will not start until reboot

I am using FF newest version, win 7, etc. I have a very strange problem. Sometimes, once every 2-4 days, my FF will not start when the computer first start. That's when the computer cold boot, I click on FF and nothing happens. I looked in task manager and there is no "firefox.exe" running. If I reboot the machine, now it boots properly. I tried clicking on the shortcut on desktop, in "All Program" or navigate to the location of "firefox.exe" on disk. I have no fancy addon's. Google TB, Download helper, Ad block plus, and Skype addon, noscript, siteadvisor, DNA (bittorrent client for Asus), Chatzilla. Any suggestion on how I can diagnose/fix this problem? tx

Hello friend, i have a suggestion:
Sometimes my Firefox closes and the same thing happens... So I close the process, on the Task Manager (famous ctrl + alt + del on Windows) and start Firefox again. Try it!:D
[]'s

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