I cannot open firefox from my desktop or start menu

I cannot open firefox from my desktop or start menu. this happened last night. IE will open and functions properly. I have the latest version of firefox installed. thank you

A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, 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]]
See also http://kb.mozillazine.org/Browser_will_not_start_up

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