More information about antivirus protection
What an antivirus does:

Antivirus programs are software that detect viruses and other malicious software, and then either removes or disables them. An antivirus can block infections from ever reaching your computer, and it can remove existing infections.

Why use an antivirus:

As viruses and other malicious software increase in complexity, sophistication, and number, infections continue to pose a hazard to home computer users. Even if you avoid opening unexpected e-mail attachments and steer clear of suspect Internet downloads, there are many other ways for malicious software to find its way onto your PC. Using an antivirus program is one of the simplest and most effective steps you can take to protect your computer. Antivirus software monitors your computer and automatically blocks and removes computer infections, preventing them from causing damage or spreading further.

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