I gave up on antivirus software but my brother needs one on his laptop so he's using Eset Smart Security.. I was using it on my previous PC.. Can't say anything bad about it, i just don't like anything using up resources
Bitdefender is a great antivirus too.. My ISP provides a free 1 year license for it's clients, so that's the only good thing they can offer since they failed on providing internet x)