Of course, Windows is always doing updates, so the answer to your question is probably yes, but I'm not sure exactly when the problem first manifested.
I did install several programs in the past few weeks. One is Safari, also a desktop utility called "Fences." I will try uninstalling these programs and see if the problem goes away.
If not, I make backup images every day that I could restore, going back about a week, then further back a day or two at a time earlier until the problem doesn't show up.
Thanks for the welcome, but I've been a member for several months, but don't post unless something really stumps me. When I first upgraded from XP to Win 7, I posted something every day or two for a week or two.
And thanks for your response.
Ken