The Windows Defender team has released the fist fully supported version of Windows Defender. What is Windows Defender? From the products web site:

Windows 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 against spyware when it's detected and minimizes interruptions and helps you stay productive. Now with 2 free support incidents for Windows XP and Windows Server 2003.

This is great for the consumer who some times just dose not understand how dangerous the web can be ;)

For more information see the Windows Defender product page or just Download!