I prefer Comodo Internet Security and Comodo Firewall both of which are free. Together they work very well! (If you are not very knowledgeable with computers or the programs they have a team that can remote control your computer to help with things in regards to their product, called GeekBuddies, cheesy I know. I have not had to use them however I've heard good things for the most part.) Then what you should have on every computer is MalwareBytes, this program is one of the best around and will help to remove most anything that gets past your antivirus.
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