Microsoft made available for download a new release of its free anti-virus/anti-malware program for Windows PCs, Microsoft Security Essentials (MSE), on April 24.
The MSE 4.0 release is available via the Microsoft Download Center and the MSE Web site. (I learned of its availability from a post on Neowin today.) The latest version runs on Windows XP, Windows Vista and Windows 7.
Source : www.zdnet.com/blog/microsoft