Windows Defender (Beta 2) 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 a new streamlined interface that minimizes interruptions and helps you stay productive.
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Webcast: Introduction to Windows Defender (Beta 2) Webcast: Introduction to Windows Defender (Beta 2)
Meet the new features in Microsoft's free antispyware program. Click Register for event, and then log in using your MSN Passport account to watch the webcast.
Find answers to frequently asked questions Find answers to frequently asked questions
Learn how to use Windows Defender (Beta 2), how to tell if you might have spyware on your computer, and more.
Compare with other Microsoft antispyware and antivirus technologies Compare with other Microsoft antispyware and antivirus technologies
Find out which product best suits your needs—compare Windows Defender (Beta 2) with Windows Live Safety Center, and more.