This beta is available only to customers in the United States, Israel (English only), People's Republic of China (Simplified Chinese only) and Brazil (Brazilian Portuguese only).Please visit the more information page to learn more about system requirements, our End User License Agreement and other important information.

To get the beta, just click here or on the button on the top of this page. This will take you to Microsoft Connect where you'll answer a few questions and then be able to download the Security Essentials beta.

http://www.microsoft.com/security_essentials/