I always thought that you had to pay for it. I'm still a little shaky on what I actually need on my computer. I had AdBlockPlus and Malwarebytes but I really have no idea what I'm doing.
They're both invaluable tools, but neither of them are proper antivirus programs. If you do a search for the best free antivirus programs of 2015 you can do a little research and either pick one that sounds right for you or barring that, making a list of the ones you find and using a random number generator to identify one.
bro, you are awesome. Thanks!
AVG and Avast have good reputations, but Win 8.1 has one built in called Defender.