McAfee VirusScan - One of the top-rated and performing anti-virus software programs currently on the market. Includes a virus definition and research library to help you eradicate any virus you may, unfortunately, encounter.

Norton AntiVirus - Another highly regarded piece of viral defense software. They also have a virus definition and research library.

CERT - Operated by Carnegie Mellon University for the Department of Defense, CERT monitors many different Internet security issues, from viruses and security loopholes to security issues for the home user.

SecurityWatch - Reports daily on security-related issues in the computer industry including viruses, credit card fraud and more.