Firefox is already running, but is not responding, and neither is Firefox Safe Mode.

Hi.
When ever I try and open Firefox, it says,
''Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.''
I tried restarting my computer, updating to the latest plugins using the Firefox Plugin Check (which is really convenient) and I even tried uninstalling Firefox and getting the new Firefox 4. However, nothing worked.
I searched for the problem on this site and it told me to run Firefox Safe Mode. I right clicked my Firefox icon and when I clicked Firefox Safe Mode, the same dialog came up and causing not even Firefox Safe Mode to run. No other Firefox window is open and task manager is informing me that no other Firefox application is running.
Thank you for reading this. Firefox is my favorite web browser and I really do not want to switch to something else.

I upgraded to 4.0b4 Beta 2 days ago and I have had no crashes, no failure to close and all of the Java script problems have vanished.
Normally I'd not advise people to rush out and try beta versions but this one seems more stable than the official release!

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    * [[Firefox is already running but is not responding]]

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    *** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
    *** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
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    * [[Firefox is already running but is not responding]]
    * http://kb.mozillazine.org/Profile_in_use

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    See "Hang at exit":
    * http://kb.mozillazine.org/Firefox_hangs
    * https://support.mozilla.com/kb/Firefox+hangs

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    See:
    * http://kb.mozillazine.org/Recovering_a_missing_profile
    * http://kb.mozillazine.org/Profile_in_use

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    I get this message when I try to start Firefox after first logging on after turning on the computer.
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    Firefox is "hanging at exit" when you exit/quit Firefox.<br /><br />
    #Stop the Firefox process:
    #*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
    #*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
    #*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
    #Why Firefox may hang:
    #*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
    #*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
    #*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
    #Use Firefox Safe Mode to find a problem with an Extension or Plugin:
    #*Don't check anything when entering Safe Mode, just continue
    #*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
    #*See:
    #**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
    #**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
    #**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
    '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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    See [[Firefox is already running but is not responding]]
    Obviously firefox should not hang after surfing a few pages. I have Firefox installed on an XP including firefox 6.0.2 and do not have problems.
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    * [[High memory usage]]
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    #* make sure you use the default theme
    #* disable all pluggins
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