

Microsoft warns that MSE should not be installed alongside any other antimalware application.

Microsoft Security Essentials is available for Windows XP 32-bit (8.61MB), Windows Vista/7 32-bit (4.28MB), and Windows Vista/7 64-bit (4.71MB).

MSE is yet another layer of defense the company is offering to help its customers fight the threats that plague Windows PCs. After a short three-month beta program, Microsoft is officially releasing Microsoft Security Essentials (MSE), its free, real-time consumer antimalware solution for fighting viruses, spyware, rootkits, and Trojans.
