Free Good Antivirus/Firewall Programs for Use
-Windows Essential for Windows 7/8 Operating System
-Windows Defender comes with Windows 10 Operating System
Other 3rd Party Free Antivirus Programs:
-Avast Free Antivirus 2016
-Avg AntiVirus Free (2016)
-Panda Free Antivirus
-Check Point ZoneAlarm Free Antivirus+2017
-Malwarebytes Anti-Exploit Free
You can find the Rating given, to the above antivirus programs by PC Mag, in the below Link
PCMag Rating
Regards,
Rajesh