If you are a very 'Safe' and 'Limited' internet, email user, the combo of AVG, Ad-Aware, Spybot S&D and Zonealarm Free should offer you enough Security Protection. But heavy users of the internet, Email , Messengers, Downloading, etc will require better protection than this. In today's 'Malware Enviroment', it's frankly not good enough anymore. Here are some tests to look.
Antivirus Tests-
http://www.av-comparatives.org/ (online results/Aug/online results)
1.Antivir
2.Avast
3.AVG
Firewall tests-
http://www.firewallleaktester.com/tests_overview.php (bottom of page/view results)
Free Zonealarm offers very poor outbound protection.
For any of you that are interested, i will list a 'Completely Free' setup below that will be hard to beat as a Freebie.
Realtime
Antivir
Jetico or Comodo Firewall
Spyware Terminator
Winpatrol
System Safety Monitor
Spyware Blaster
On-Demand
Ewido
A-squared
Superantispyware
Switch to Firefox or Opera Browsers.
CCleaner to clear out anything hiding in the temp files.
POP Peeper to delete spam right on the server.