Windows Defender compared with other Microsoft antispyware and antivirus technologies

Windows Live OneCare safety scanner – A Web service designed to help ensure the health of your computer with free scanning tools that help you get rid of unwanted software.

Malicious Software Removal Tool – A security tool that checks your computer for specific viruses and other malicious software and helps remove any infection found.

Windows Live OneCare – A set of security tools that runs quietly on your computer, with little or no intervention needed from you to maintain it.

Microsoft Forefront Client Security – A security tool that helps protect business desktops, laptops, and file servers from threats such as spyware and rootkits, as well as from viruses and other traditional attacks.