i haved used alot of them mostly free ones right now i am using Avira anti virus. avg would crash me out while playing games give me bsod. bit defender free cant tell what it is scanning i would like to see it work and see what it scans. i  have used avast and norton is free with my internet service. but norton had always deletes freelancer and love that game. i go with Avira right now and malwarebytes. as for broswer add in i dont use them if you get that hokie fbi warning all you do is go into your task manager and shut down your browser . also use an external hard drive and back everything up make yourself a sytem image and rescue disk.

 
Norton Security works fine on my PC.