Windows Live OneCare Help Center
About Windows Defender
Windows Defender is a security technology that detects and removes spyware from your computer. Windows Defender can help reduce the negative effects associated with spyware, including slow computer performance, annoying pop-up ads, unwanted changes to Internet settings, unauthorized use of your private information, and more.
Windows Defender uses real-time protection to alert you when spyware and other potentially unwanted software attempts to install itself or run on your computer. You are also alerted if programs attempt to change important Windows settings. You can schedule Windows Defender to scan your computer on a regular basis, helping to protect it from spyware and other forms of malicious software.
The online Microsoft SpyNet community helps you choose whether to block, allow, or remove potentially unwanted software. SpyNet trust ratings show how many other members have allowed, blocked, or removed the same software. In turn, your choices are added to the community trust rating to help other users make the same decisions.
- If you do not install Windows Defender when you install Windows Live OneCare, a yellow advisory will be raised in Windows Live OneCare with instructions on how to install Windows Defender. For more information, see Windows Defender did not install.
- For more information about Windows Defender, visit the Windows Defender web site.
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