Try turning off the process using the Task Manager, then launch it.

Thanks for your fast reply. Can you take me through the process of how to do this. I'm a senior still learning. Thanks much, Steve.

I think finitarry means the following:

Press Ctrl+Shift+Esc to call up the Windows XP Task Manager. (It's also one of the buttons when you press Ctrl+Alt+Del)

There are two tabs where Firefox might appear:

• Applications: usually this means Firefox launched fully and is running in a window you should be able to see. You could try switching to it on the Applications tab, or "kill" it using End Task.

• Processes: when Firefox doesn't load fully, you may find firefox.exe on the Processes tab even if it isn't listed on the Applications tab. Here you select firefox.exe and click End Process.

A possible cause is security software (firewall,anti-virus) 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 and the plugin-container 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 and the updater process.

See:

• https://support.mozilla.org/kb/Server+not+found
• https://support.mozilla.org/kb/Firewalls

See also:

• http://kb.mozillazine.org/Browser_will_not_start_up