Can't open Firefox 16.0.2

Firefox was working just fine until I updated to Firefox 16.0.2 and now can't open the program at all. When I double click on the Firefox icon or click "Open", I get the moving circle for about 10 seconds, then it just goes away and the program does not open. Anyone have this problem; found any fix?
I have run a boot scan through Avast anti-virus, run Malwarebytes (no bugs shown) and used Fix-it to fix registry errors and defrag. I also checked my ZoneAlarm firewall programs list and made sure Mozilla is in the trusted zone. I uninstalled and re-installed Firefox after doing the scans.
Both Internet Explorer and Google Chrome work just fine, but I'd rather use Firefox.
My computer is an HP 64 bit running Windows 7.
Any help will be greatly appreciated.
Thanks

If there are still problems with an update then uninstall the currently installed version and delete the Firefox program folder to remove any leftover files.
*C:\Program Files\Mozilla Firefox\
*http://kb.mozillazine.org/Installation_directory
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 16.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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''Scott [[#answer-710824|said]]''
<blockquote>
With a Finder window open, are you able to force quit Firefox by selecting the Apple menu > Force Quit > Firefox?
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</blockquote>
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