To everyone in the Norton Community, I have some information to pass on;
At about 0730 EST (United States) 12 Jun 15, I clicked on my Norton Utilities shortcut and a box appeared indicating that my 'trial offer' has expired and I need to click on the 'activate' button. NOTE: I had been using Norton Utilities (fully paid version) for a couple of years and was NOT using a 'trial' version.
I did not click on the 'activate' button, but instead, 'x' ed out of this suspected malware. Apparently by either 'x' ing out or simply running my cursor over this pop-up was enough to cause my computer to display the 'blue screen of death' and freeze up so that that even the power button no longer worked. I had to reset my computer (using the motherboard on-board reset button), then re-start my system. Subsequent use of Norton Utilities seems to have [hopefully] eliminated this threat for now.