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Discover Windows Defender

Get an overview of Windows Defender, a program that helps you detect, disable, or remove spyware and other potentially unwanted software. Windows Defender and subsequent definition updates are available free to users of genuine Microsoft Windows.


Confused about spyware? Curious about compatibility? Wondering why you need Windows Defender? What happened to Microsoft Windows AntiSpyware? Get the answers to these questions and more here.

By using Windows Defender, you accept the terms described here. If you do not accept them, do not use the software. Please read the terms.

What kind of system do you need to use Windows Defender? Most computers that run genuine Microsoft Windows can use the program. Get the full system requirements here.

See how we've enhanced the latest release of Windows Defender, and learn about known issues.

Windows Defender is one of several security technologies that Microsoft has developed to help protect your PCs and networks at home and at your business.

Read what people are saying about Windows Defender.

Read what the media, industry analysts, and other observers say about Microsoft's antispyware program and its role in helping to protect home and office computers.

Download Windows Defender

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