Microsoft Security Essentials

If you are running Windows 7 (no longer support by Microsoft as of 01/14/20), Microsoft Security Essentials (anti-virus program) and concerned about support for virus database updates, here is the latest news:
https://support.microsoft.com/en-us/windows/what-is-microsoft-security-essentials-c25ad47a-7d15-8072-1438-b07dffcbbb20

Microsoft will provide updates for Microsoft Security Essentials until 2023.

The program is available for download from Microsoft here:
https://www.microsoft.com/en-us/download/details.aspx?id=5201

Alternatively, you can download the program from here:
Windows 7 32bit
Windows 7 64bit