Its no good to have 2 antivirus programs running together - you have CA Suite and AVG. If you don't have faith in the CA Suite then uninstall that. I remember reading somewhere that CA antivirus rated poorly.
Don't say you don't need a firewall, a firewall prevents direct attacks from hackers. Microsoft realized their mistake by not enabling their firewall by default and corrected it with XP SP1. If you are going to remove CA Suite, then you will need a firewall, Comodo is very well rated and its free.
If you don't like AVG, then there is Avast, which is free. It is pretty well regarded around here.