Which computer security software would be the cheapest and the most efficient?

I had Norton before but I heard from some people that it only costs a lot and that it lets a lot of viruses pass by. I’m not sure if I should believe them, but I definitely am open to new options. Because I am totally ignorant about computers, I need all the advice I can get. Please help!

MICROSOFT-VIRUS/ (UPDATE 1) – Fort Lauderdale Sun-Sentinel

… vulnerabilities in software that they can exploit to launch attacks on computer systems. Indeed, the world’s biggest software maker said that the patches released on Tuesday include software to fix a vulnerability exploited by the Stuxnet virus — a …
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What is the best computer security system money can buy?

I really don’t care about free prorams or paying, all I want is something good. If you want, say what’s the best paid program and what’s the best free program.

Antivirus
Firewall
Whatever Else
Also, what’s your opinion on the Windows Live OneCare?

Here You Have: Another Nasty E-Mail Virus – Associated Content

Here You Have is a brand new Trojan virus, which our security software is not yet prepared to protect against. It is designed to attack computers using Microsoft’s Windows operating system. See a sample of the email here on the McAfee Labs Blog.
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