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There are several computing or PC magazines that give a clear comparison of various antivirus software. Some of these include PC Magazine, PC World, and Maximum PC.
Mirror is nothing utility in antivirus software
These programs are called "Antivirus Software". You can find these all over the place, I wouldn't recommend downloading a free one you found on the internet as those are somewhat likely to contain a virus. I personally use Norton Antivirus to protect my computer, I haven't had a virus in quite some time. Here is a list of Antivirus Software that I know is safe that you can use for your PC. Norton Antivirus McAfee Avast Vipre Antivirus Kaspersky
Application software
"antivirus" is protective software designed to defend your computer against malicious software.
Antivirus software will notice about the virus,malware,spyware etc
Sites like Cnet and PC world offers great comparison of anti virus software. They compare all the unique features, pricing and available options. They also give a comprehensive review of each antivirus software.
One can download eTrust antivirus software for free from sites such as CNET download, bestshareware, or techserious. It is reviewed by CNET as being a dependable antivirus software.
Norton and pretty much all antivirus software give false positives at times. Now it is less common that it happens but people have to understand the enormity of the task. Your antivirus software is searching through millions of characters and thousands of files looking for code that performs a malicious act. That is the equivalent of a person scowering a whole city for one pin. It's a large task and antivirus software are doing things a person could never do.
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Antivirus 2009 is rouge software. Spyware Doctor is not. I got antivirus 2009 because i didn't know what it was. But Spyware Doctor isn't rogue software. But if you have Antivirus 2009 you're computer can be at risk.
NOD32 antivirus software offers a small file size when compared to other antivirus brands. It has also failed to miss an "In-The-Wild" virus, a claim that no other antivirus software can make.