Mozilla doesn't open

Recently I have a problem with Mozilla Firefox. I am trying to run it and doesn't open but in proccesses it's appears that is running!!!!
Internet Explorer is running normal without any problem.
Is there any solution?
Of cource I scan my computer for viruses, spyware (Spybot) and I clean every registry from Firefox after I uninstall it, but nothing changed.
I would appreciate any answer-solution.
Thanks in advanced

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process.
See:
* [[Server not found]]
* [[Firewalls]]
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

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