I've used Norton, McAfee, Panda, Avast, Fsecure, AVG, Eset, Ad-Aware, CA, Webroot, MSE & TrendMicro. I have opinions on all of them. Most are solid several are so questionable that if asked I will suggest avoidance or immediate removal. In the end these are all personal choices and as long as regularly updated and run are better then then best of the best not updated and run. What ever you choose learn to use it properly and then single most important rule is avoid those obvious sites and phishes that can be spotted form a mile away and if you get attacked update and deep run AV best from safe mode several times till nothing shows and learn.....always learn, we are the best first line of defense against attacks.