Another thing to consider is. A virus and malware are two (2) different things. A VIRUS usually destroys your computer and doens’t make “profit” directly likr malware can. Malware seeks to make a major profit. An example is the Bitcoin Trojan. It “mines” bitcoins for profit for the owner. The only malware/virus that is the border of both is Cryptolockers which can destroy your computer if you don’t pay a ransom. Avast! or some other type of AV is needed to protect your computer. Ignorance of these facts is going to land you in Malware City.