The Internet is a great place to find information and entertainment. Unfortunately, it's also an easy place to find viruses and other harmful programs.

Protect your computer with Avira Free Antivirus. It's a powerful, free program that rivals the best paid products for protection.

In addition to typical system scans for known viruses, it can detect potential new viruses. It even has a feature that keeps hackers from using your computer as a bot.

There is also a premium paid version of Avira that adds a malicious website detector and live technical support.

Cost: Free
Link: www.avira.com 
System: Windows

Cost: Free
Link: www.avira.com 
System: OS X