Microsoft Security Essentials

Microsoft Security Essentials (MSE) is an antivirus computer program that provides protection against different types of malware such as computer viruses, spyware, rootkits and Trojan horses. It uses the same antimalware foundation as other Microsoft antivirus products, although it lacks the centralized management features of some of them. This product runs on Windows XP, Windows Vista and Windows 7, but not on Windows 8, which has a built-in antivirus component. The included license agreement allows home users and small businesses to install and use the software free of charge.