  | 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. |
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