For me, I don't really use a firewall except the standard one, (which is really bad idea probably), but I use malwarebytes. I scan every week or so, or when something looks suspicous, like a download. Before that time, I did have to wipe my PC once. From some virus that said EVERYTHING ON YOUR PC HAS A VIRUS PAY ME MONEY AND I'LL FIX IT kinda thing. Wouldn't allow me to open ANYTHING. Later viruses included. -Windows quantum defender or whatever. It is the dumbest virus ever. It clames to be a A/V, but no lol. I easily got rid of it by right clicking on its Icon, open file location, and delete. LOL. -Some virus that locks up your PC from "ENGLISH INTELLEGENCE" or something like that, claiming to be doing all this bad stuff. You have to pay $200 to get rid of it. I found a soloution: Disable internet. After I found a soloution in the libary, I managed to get rid of it. -Another thing similar/exactly the same of my first virus. But I managed to remove it via libary again. That's all I've had. AND I use google chrome+ adblock. I find ads usually contain viruses, even if you don't click.