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For Anti-Virus there are quite a few choices: AVG (free), Avast (free)
which is what I use, AntiVir (I don't know if it's free or low cost, and
eTrust. The heavy hitters are NOD32 and Kaspersky though I have heard some
complaints lately about Kaspersky getting more resource heavy. Here is a
website that compares AV products.
http://www.av-comparatives.org/seiten/home.html
For firewall there is Zone Alarm (free and paid), Sunbelt Software's Kerio
Personal Firewall (free and paid. I currently use this) and one I just
heard about which is getting good reviews - Comodo Personal Firewall. I
am going to try that out on one of my installations to see how it is.
You should also have several other non viral anti-malware apps including
Adaware SE, SpyBot S&D, SpywareBlaster (does not scan for malware but
prevents it from getting installed) BHO Demon, and possibly Windows
Defender.
Here are some useful links for dealing with malware:
THE PARASITE FIGHT
Finding, Removing & Protecting Yourself From Scumware
http://aumha.org/a/parasite.htm
Richard Harper's Guide to Cleaning Pests
http://rgharper.mvps.org/cleanit.htm
http://www.elephantboycomputers.com/page2.html#Removing_Malware
The most important component in safe hex is the user. Most malware is
installed because the user allow it to.
http://www.cert.org/tech_tips/before_you_plug_in.html#III
http://www.claymania.com/safe-hex.html
Protect Your PC
http://www.microsoft.com/athome/security/protect/