|There are both free and paid versions of Malwarebytes. The link below has both.|
I suggest you get rid of Norton. I use MSEssentials but many here prefer other free AV.
You can have more than one malware program but only one AV program. MSE is both but malwarebytes may find stuff MSE misses. That is true for most malware and AV programs. None are perfect.
Norton and McAfee are resource hogs. That is the main reason to dump them. MSE is light on resources. Malwarebyte need only run occasionally.
Get CCleaner Slim from the link below. Excellent cleaner and safe registry cleaner if needed.