Thanks, AnEdge and caperjack for the continued help. This looks promising. I'll report back when I've completed the described steps.

Thanks for this Rose W. I've scoured and posted on various tech boards and the consistent outcomes seem to be "create a new power plan and do a clean install." According to one source, my computer is...

Reply to Rose W: I've unplugged the only USB that I have (not a USB hub) and still no go on the shut down. :( I'm going to have to refer this issue to a local computer tech shop to find a remedy....

Reply to caperjack: I ran the commands you provided and here are the results:

(1) sfc /scannow - Windows Resource Protection found some corrupt files but was unable to fix some of them. Details...

Reply to caperjack and Rose W: neither suggestion worked on my system but thank for the advice. I'm baffled by this issue so I'll take it to a local computer shop that's helped me before.

Thanks for the welcome and the advice, caperjack. I'll try the new shortcut approach and report results.

Windows Update recently downloaded and installed Windows 10 Pro version 1511 10586 on my HP Elite 8300 CMT desktop. So far, this OS seems to work quite well except it won't shut down when I click...