Antivirus and antispyware products from Microsoft compared
Find out how our antivirus and antispyware products compare with each other.
Learn more about these products
A security technology that helps protect your computer against spyware and other unwanted software. Windows Defender comes with Windows Vista. If you use Windows XP SP2, you can download Windows Defender for no charge.
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.