No problem.

Since you have an ample amount of RAM, there is no reason to close ZoneAlarm and Norton; they can only help you. However, it is still possible that ZoneAlarm may be blocking packets of information from the ports that JJ2 uses. You might want to test JJ2 out with ZoneAlarm disabled and see if your performance increases. If it increases by a large margin with online play, you should check the port settings for ZoneAlarm to see if JJ2's ports (10052-10054, maybe up to 10057) are blocked. If they are, unblock them if you want to play JJ2. If you see no significant increase in performance, feel free to keep it on in the background. Norton is nice to have, too. Make sure you keep updating the virus definitions, though. New viruses pop up rather quickly.