I have used McAfee VirusScan 2004, 2005, and 2006 and they all have worked well for me. You can download a 3-computer version of VirusScan from McAfee.com for $69.99 after rebate, or you can download the 3-computer version of Internet Security Suite for $99.99, which includes anti-spyware, firewall, and privacy service along with the anti-virus. I don't use Internet Security Suite because I don't need the extra programs.