I use free version of Avast antivirus and quite content so far
I don't even like. He just writes constantly struggling with something, and once you get the virus it transmits. I do use Windows defender. Me while arranges.
I also use a standard defender, Windows 10 and no problems. Do I make the image your working drive and if any virus I will interfere I'm for 10 minutes can recover all the information. If you're on the computer doing something top secret that this computer should not have Internet access. In all other cases, I doubt that your comp is of interest to someone.