Hi, I actually using Avast, free version. It is pretty good for me, I didn't have any problem with it and it is obviously free. I recommand it for everybody.
to me its avg. I use it and i've never had problems. Always that there are a file that is a virus he tell you and you can delete it right away. With avast for example, that happened after some time.
Well there are many antivirus even i cant mention their names here but some of top are Bit defender,Kaspersky,Norton and Eset and if any one want with its key then do contact me