Best free antivirus softwares for Windows 7

We all know that as earlier Windows OS versions, Windows 7 is also prone to virus and spyware attacks. And to stay free from viruses, it the most basic and fundamental task of any Windows user to find the antivirus software programs.
Antivirus software listed below are fully compatible with Windows 7 – 32 and 64 OS and available freely on the internet for single and non-commercial use.