My brother just bought a new computer two months ago and now he’s having a lot of trouble with it. He thinks that most of the issue is Norton Antivirus.

I’ve suggested to him that he either invest in one like what I run (Kaspersky) or that he search for quality open-source options. Since the latter is free, he would prefer that.

(I’m asking this question for him since he can’t access the internet.)

Anyway, what is a good open source antivirus program?