Are you looking for a good anti-virus that is free. My current recommendation is Free Sophos Home. https://home.sophos.com/en-us/free-anti-virus-windows.aspx
Sophos Home the free version comes with Real Time Antivirus, Parental Website Filtering, Web protection, Remote management, and support for 10 PC's and Macs from one free account.
I have used the Sophos Endpoint paid version for several years at my work and has been a great product.
Web Protection and Parental Website Filtering are useful from keeping all computers from known infected websites. Sophos makes this easy by having categories. You want to block all know malware/spyware infected websites.