Support for Windows 7 is ending on January 14, 2020
We recommend you move to a Windows 10 PC to continue to receive security updates from Microsoft. Learn more.
Your computer must run genuine Windows to install Microsoft Security Essentials. To determine whether your version of Windows is genuine, see What is genuine Windows?
Microsoft Security Essentials is designed for personal computer users. If your business needs security, go to Forefront Client Security Downloads on the Microsoft TechNet website.
Microsoft Security Essentials website.