Hello Marv, I run a small computer repair store and for the last 2 years have been installing Malwarebytes with many different free anti-viruses and it works with all of them. We don't know the spec of your computer, (cpu speed & memory) but it is best to put this info in your post so people have a better idea of how much your system can handle. Norton over the years is getting better all the time (using less resources) but I am not a fan of their software and have actually never paid for a anti-virus. I repair about a 100 systems a month and I can tell you that 60% or more that come in are running Norton, 30% McAfee and Kaspersky, the other 10% are a mixture of free anti-virus companies. By the numbers in my area the free anti-virus companies are doing better. I personally run Avast with Malwarebytes. If you really are looking for more protection look into running Sandboxie when you browse. Mike