Yes, JDS, you are correct that you were pushing for a scan disk after a chkdsk (and also a DISM). I, in an overabundance of caution, wanted to read up on anything I tried before doing it, as I have caused more problems in the past by just trying things without fully understanding the ramifications.
On one of my old computers, I think that Norton utilities (Norton Disk doctor etc.) may have provided some of the functionality of scan disk and chkdsk, but I have not installed that on my computers in recent years. I had already researched chkdsk due to an I/O error trying to make a system image backup, but had not used scan disk as you demonstrated to me. It is a nice little tool to have in one's toolbox.
As I mentioned in an earlier post, I'd like to use the system for a few more days and make sure that I have no further problems (especially with my devices). Then I will close this post.
Thank you again for your help. I am really overwhelmed by the kindness of people trying to help others in this forum. I was helped once before a couple of years ago, and I continue to be very grateful for those who give of their time and knowledge to help those of us who "get in over our heads" with problems.