Cannot run Firefox

I cannot get Firefox to start at all. I have tried opening the browser from the short cut on the task bar, from Start -> programs, by double clicking the desktop shortcut icon but none of these open Firefox. I have rebooted the computer but the problem is still occurring. I can't even get the profile manager to run. I type the command into the run box but nothing happens. Windows recently did a major update but Firefox was working fine yesterday after the update installed but today I can't get anything Firefox related to work.

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. <br>
'''Note''': ''This will cause you to lose any Extensions and some Preferences.''
*Open websites will not be saved in Firefox versions lower than 25.
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Did this fix your problems? Please report back to us!
Thank you.

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    I recommend backing up your Firefox settings in case something goes wrong during the next few steps. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information]. (You can copy your entire Firefox profile folder somewhere outside of the Mozilla folder.)
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    Do a malware check with some malware scanning programs.<br />
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    * http://www.superantispyware.com/ - SuperAntispyware
    * http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
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    Get it here: <br />
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    ##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
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