Microsoft Security Essentials is a free program that protects against spyware, viruses and malicious software. It is designed to be simple and easy-to-use and is generally aimed at average users, but it can also be used by small businesses.
Microsoft Security Essentials is available for Windows Vista and Windows 7. It is available in 33 languages. It has also received numerous awards for its high standard of protection: the VB100 award from Virus Bulletin, Checkmark Certification from West Coast Labs and certification from the ICSA Labs. It is built using similar technology as Microsoft Forefront and Windows Defender, both of which are used to protect giant networks and databases.