http://192.168.2.20/blogs/doverton/archive/2006/11/08/windows-defender-released-to-market-free-anti-spyware-product.aspxWindows Defender is a free program that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. It features Real-Time Protection, a monitoring system that recommends actions againstenCommunityServer 2008.5 SP2 (Build: 40407.4157)