so far the default app setting for various graphics files (phg, jpg, jpeg, etc) were reset to the Windows 10 Pictures viewer instead of what I had set (Windows 7 Photo Viewer) and those for my music files (mp3) were changed.
I recently built a new PC and before running Acronis to make a backup Image I ran Repair to see if anything was amiss on my newly built PC. 20-20 hindsight says I should have made an image FIRST, then run Repair, then made another Image. Oh well.
thanks for your suggestions for fixing things.