Thank you, Jeff. That remedy almost seemed too easy, but it worked.
Now, the other problem is the Standby feature. When I press Standby, the dialog box opens saying that Windows is preparing for shutdown. I've waited several minutes and, when shutdown doesn't happen, then hit ctrl/alt/delete to exit that application. It won't exit, though. If I choose shut down, the screen dims, icons fade, but it won't shut off. I then have to shut down, reboot, and wait for the scan before the reboot proceeds. Any ideas on this one? This just happaned out of nowhere.