Security software is one of the first and best things to install on your computer. An unprotected Windows computer can pick up a virus on the Internet in under a minute.

Even Macs aren't immune to viruses. A recent Trojan outbreak infected more than 600,000 Macs worldwide! Learn how to detect and remove it here.

Protection doesn't have to be expensive, though. Research shows that free antivirus solutions are just as effective as paid programs. In fact, many companies offer the antivirus engine of their paid products for free. Here are some of my favorites.

Avira Free Antivirus - Avira is one of the top-rated antivirus programs. Its detection and removal engine matches or beats most paid programs.

Not only is it free, Avira has versions for both PC and Mac. You can learn one program and keep all the systems in your household safe!

Sophos Anti-Virus for Mac Home Edition - Need a simple solution to keep your Mac safe? Sophos is a powerful, easy-to-use program. It runs automatically to keep your system safe from viruses and other malware.