I downloaded Firefox 5.0. Firefox will not open. States running offline. I have a Intel Pentium/Windows XP system.

I downloaded Firefox 5.0. Firefox will not open. States running offline. I have a Intel Pentium/Windows XP system.
This also happened when I tried to download Firefox 4.
Firefox 3.6.18 works fine

You may need to delete the Firefox program folder before (re)installing the latest Firefox.<br />
In case you still have problems after installing then check your security software.
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 and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
*http://kb.mozillazine.org/Browser_will_not_start_up

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