Anti viruses, what are the fields that anti viruses do not cover???

1. what are the things that an anti-virus program does not cover? thats the important part of the question. e.g. anti virus is different from a firewall, or anti spies, anti hacking, or programs for worms, etc. in short,

2. what is the best combination of using all or some of such programs, what is the best way to secure a pc for a home user? all of us install anti-viruses but not many of us are sure about their choice of the programs. it often hapens that a smaller or less complicated anti-virus program finds a virus in the presence of a more complicated (absent minded) anti-virus program.

3. what is the best way for finding out which anti-virus is better than the other, HOW TO COMPARE? everyone says i use bla bla, and its the best,

4. where to begin, and how to sort it all out??? sorry for my ignorance...!!!

Anti viruses, what are the fields that anti viruses do not cover???free antivirus

Antivirus programs protect your computer from programs that could possibly damage Windows or any of your files, and from any files that result in system damage. Antispyware protects against spyware and malware, which, unlike viruses, may only keep track of what websites you visit and report this back to a source, where they then launch ads on your computer. Both viruses and spyware slow down and hurt your computer. A firewall stops spyware and viruses from getting on to your computer in the first place by blocking (or at least attempting to) all connections from outside sources that you don't allow.