Microsoft Security Essentials

Microsoft Security Essentials is a new, free consumer anti-malware solution for your computer

Microsoft Security Essentials (MSE) is a new, free consumer anti-malware solution for your computer provided by Microsoft. It helps protect against viruses, spyware, and other malicious software.

It's available as a no-cost download for Windows XP SP2 and higher, Windows Vista, and Windows 7.

Visit the Microsoft page for more information and a free download:

http://www.microsoft.com/security/pc-security/mse.aspx