I ran MWB total scan 2 successive days and her machine comes up clean.
I ran the Norton Eraser just to be sure and it too came up clean.
Even though she hardly ever downloads or installs absent me around, I've explained to my wife about the check off boxes found with installers.
I'll continue to periodically run MWB periodically.
I continue to think that the random, periodic problem she has either with a stalled shutdown or stuck boot is likely an OS quirk that may just work itself out over time.
Mark