I used Norton for years and finally got tired of paying for it year after year. I use Microsoft Security Essentials you can download it Free, and then I also use MalwareBytes....you can also download it Free and you can also purchase a One time upgrade for 24.95 (I think that was what it was...not much more) that offers more options.....and you can put it on 3 computers for the same price. I have been using both for over a year now and have had NO problems with either. Some people don't like either.....but everyone is different and has their own preferences.