Firefox won't open, I've deleted old profiles, deleted all Firefox files and gone through all fixes. It still won't run.

Firefox stopped working this morning. I've gone through the process of deleting the old profile and uninstalling Firefox, then reinstalling it. It worked for about 10 minutes then disappeared again. I've gone through the whole clean reinstall and new profile process but can't get Firefox to work at all. This is really frustrating as I've spend over an hour trying to sort it out.
What can I do now?

Rather a difficult question to attempt to answer, as you obviously have already tried the obvious solutions.
Often it is security software or Firewalls interfering especially after a Firefox update. Deleting program files is required when doing a clean reinstall and you may wish to use a clean profile but it is probably best to ensure Profiles are backed up and retained maybe just move the whole profile rather than deleting them because the information is often useful. The profile has your Bookmarks and passwords etc.
* Windows previous file versions may help if you need to recover a profile <br /> http://windows.microsoft.com/en-us/windows/previous-versions-files-faq#1TC=windows-7
*[[Back up and restore information in Firefox profiles]]
*[[Configure firewalls so that Firefox can access the Internet]]
* [[Fix problems connecting to websites after updating Firefox]]
See also
* [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox]]_5-reinstall-firefox
* http://kb.mozillazine.org/Standard_diagnostic_-_Firefox
* [[Firefox won't start - find solutions]]
* http://kb.mozillazine.org/Browser_will_not_start_up
Where are you getting Firefox from, you should use the official site for instance
* http://www.mozilla.org/en-US/firefox/all/
Presumably you will be aware that supported Firefox software on Windows is a 32 bit application. That applies even when Windows 64 bit is used, as appears to be the case with the machine you posted from. I mention that in case you have been trying 64 bit builds.
What error messages are you getting ? anything in error logs ?
* http://windows.microsoft.com/en-gb/windows/what-information-event-logs-event-viewer#1TC=windows-7

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Firefox won't open, I've deleted old profiles, deleted all Firefox files and gone through all fixes. It still won't run.

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