Installation of Comodo Free Firewall Crashed System, Now Firefox Won't Launch

I installed Firefox 4, then my ZoneAlarm Free Firewall and Free AVG 2011 Antivirus were rendered incompatible. As a result, I installed Comodo Firewall --- I did not uninstall Zone Alarm or AVG. Comodo instructed me to restart the laptop in order to finish the successful install. When I restarted the laptop, it crashed. I restarted in Safe Mode and did a system restore ---went back 6 days. Now Firefox won't launch.
What happened and how can I fix it?

Hi thanks for that. I've been through those pages already. I think maybe my lack of knowledge is hindering me somewhat. However the page you linked assumes two things: I can see the processes on Task Manager and I can start up Firefox. The latter is unusual. You see when it suggests changing or creating a profile, I have to use the profile manager which is part of Firefox - which I can't open.
I don't think a previous session is still running because I've restored and installed so many times.
While I appreciate the speedy response, if anyone has any ideas using words, I'd be extremely grateful. :0)

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Installation of Comodo Free Firewall Crashed System, Now Firefox Won't Launch

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