I did look at Device Manager but didn't find any unknown devices.
I did, however, run into a problem which seemed to be associated with one of the RAM memory modules. I ordered new RAM, installed it, and the problem has yet to reappear. From what the computer tech told me, the problem may have been that one section of one module was going bad. Only time will tell if this is the case, as the new modules have only been in place a few days.
I have done additional reading, on both the MS Ask the Community, and other sites, and also have heard from some in-laws, and have decided to not try upgrading to Windows 10 due to what I've heard and read. In-laws do not like Windows 10 at all, they want their old Windows back. Reading on the MS Ask the Community there are many who feel the same, for one reason or another. And it's the same for other sites I'm visited, many do not like how Windows 10 operates.
And then there's all of the troubles I've had just trying to upgrade to the new version. After 30 tries, despite being told by three different MS programs that my system is compatible, it's time for me to just keep what I have. I did toy with a clean install from a purchases copy from the computer tech who worked on my computer, but after the 30 failures I experienced I've no guarantee that even a clean install would work.
So consider my upgrade attempts at an end. Thank you all for the help that was provided.