This should help, if you want to get rid of ZoneAlarm.
I would use Avast before AVG. Just my opinion.
All below is Free
AVG =
http://free.grisoft.com/doc/download-free-...-virus/us/frt/0
COMMODO =
http://www.personalfirewall.comodo.com/
PEERGUARDIAN =
http://phoenixlabs.org/pg2/ and click on the one thats for your system...if xp its the 2nd one down 0.84MiB
http://www.avast.com/ AV
http://www.ccleaner.com/ http://www.spybot.info/
Hope this helps.