As soon as I ran the first update to Norton 360 I received the same Ransomware notification from MalwareBytes as described by Scubnubby above. The same files are identified and quarantined. At that point Norton will not run. I deleted the quarantined files and reran the Norton install from scratch 2 times. Each time it flags NortonSecurity.exe as ransomware as soon as I run LiveUpdate. Malwarebytes flags during the Process Update step. I do not get this problem on any of my other computers. All of my screen captures of this event would be identical to those above but dated Sept 21.