I helped Dad troubleshoot the desktop. It appears there was a corrupt updater that was bogging things down, to the best that Dad and I can figure. But it is handled, and the computer seems to be running much better now (for a seven-year-old computer).
You can see I was a big helper. I offer vital input, like moving the mouse with my head, or blocking the screen when Dad needs to rest his eyes. I'm not sure how he could have done it without me (and some tips from William).