I was installing MplayerX when Safari opened and all kinds of weird windows were popping up and disappearing too fast including the MacKeeper application window. The MplayerX installer must have had MacKeeper bundled inside it so I immediately took action to contain the damage. I disconnected my Mac Pro from the internet, closed all the popup windows and quit Safari. I used EasyFind to search for any malware apps and sure enough EasyFind found the following files and folders: MacKeeper, MegaBackup, some Yahoo helper search tool, and several files inside the LaunchAgents folder dated today. I moved all files to the Trash, restarted the Mac Pro, empty the Trash, then opened Malwarebytes to scan for any leftover crapware. Malwarebytes reported no other threats found. All is well, I hope so.