Mac crashes on restart if I have deleted . . .
. . . if I have deleted a "leftover" file that Malwarebytes and Norton flag as a security threat. Months ago I installed MacKeeper. Then I uninstalled it, and a leftover file (Library/Security/SecurityAgentPlugins/MKAuthPlugin.bundle/Contents/MacOS/MKAut hPlugin!) is flagged. If I choose to let either MalwareBytes or Norton delete it . . . OMG! The system will always crash on restart, and then I have to do a restore from Time Machine. If I ignore the threat warning, everything will be OK. Needless to say, I have improved my sanity because I have quit doing the same thing (deleting the file) over and over again while hoping for a different result. Anybody got any ideas that I might pursue in order to get my machine cleared of this leftover file? I have a late 2014 production of Mac 27" Retina 5K, running High Sierra, latest version.
iMac with Retina 5K display, OS X El Capitan (10.11.4)