Microsoft Security Essentials
Microsoft said it would continue to support Microsoft Security Essentials (MSE), its antivirus software on Windows XP systems, through July 14, 2015. Enterprise users will get updates for System Center Endpoint Protection, Forefront Client Security and Endpoint Protection, and Windows Intune running on XP, Microsoft said.
The retiring operating system also will be supported by a variety of other freely available antivirus programs. Avast, Avira, AVG, Bitdefender and Comodo indicate that they will continue to push down updates to their suites on Windows XP systems. The programs will help defend against attacks targeting the browser, its components and other applications, but it's unlikely that the antivirus will detect attacks that target vulnerabilities in the operating system.