http://blogs.msdn.com/securitytipstalk/archive/2006/11/02/what-s-the-difference-between-spyware-and-a-virus.aspxA reader recently wrote us to say that Microsoft Windows Security Center was telling him that he had no antivirus software installed. He had finished his free trial of Microsoft Windows Live OneCare and removed it and then installed Microsoft WindowsenCommunityServer 2.1 SP1 (Build: 61025.2)