Norton is a load of garbage like most antiviruses that are commercial base, they slow your system down, take control of your files and create headaches and error messages then fail significantly in preventing viruses from getting through, Norton is actually like a virus itself, don't believe what people say about these antiviruses, they just haven't got a clue as to what trouble lies ahead for them, especially with hackers, just stick with the free bases systems like malewarebytes avast etc, there about the best you can get in the way of protection without headaches, make sure though you disable the webrep in avast it has been known to slow down the internet speed in over protection mode, something that Norton does without protecting your system.