I'm running Avira on a total of 5 family PC's. Avira is a free antivirus program and does its job very well.
Everytime I do a clean up on the Grandkid's PC I never find anything serious, maybe the odd PUP. The kids are all over the place playing games Roblox, Steam,, Youtube... you name it. I run Malwarebytes and Avira on all PC's nothing serious if anything ever gets through. Yet!