Cannot reload Firefox after shutdown

After closing Fire Fox the only way l can reopen it is to reinstall it, the rotating circle appears but after a few seconds it disappears.
This has been an intermittent problem over the last couple of months.
I'm using Windows 7 service pack 1.

See:
*"Hang at exit": http://kb.mozillazine.org/Firefox_hangs
*"Firefox hangs when you quit it": https://support.mozilla.org/kb/Firefox+hangs
Use "Firefox/File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit") to close Firefox if you are currently doing that by clicking the close X on the title bar.
Which security software (firewall, anti-virus) do you have?
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

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Please scan with all programs because each program detects different malware.
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*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
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no need to delete imho. this post can be useful for other people

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Cannot reload Firefox after shutdown

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