Firefox 4 does not start but I can see Firefox.exe in Windows Task Manager, nothing in Applications

I am on Window 7/32bits machine. When I start Firefox 4 nothing loads. I looked into Windows Task Manager, I can firefox.exe in the processes but nothing in Applications.
Here are few things I have tried but didn't work for me.
- Restarted Computer and tried to open Firefox, waited for half an hour nothing happens.
- did 'End Process' in Windows Task Manager, Processes and tried in again
- reinstalled into different folder and tried to run from there, still the result is same.
Is there anything else I can try to resolve this issue.

See:
* http://kb.mozillazine.org/Browser_will_not_start_up
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:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls

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