Okay, another piece of the puzzle.I tired resetting the network, and uninstalling and reinstalling printer and network sharing.
Also, I was at a meeting today at a site with open wi-fi. at least five other laptops, including one macbook, connected, my LG phone connected, and my Kindle Fire connected to the wi-fi network. My Win10 laptop saw the network and "connected" but it never displayed the required log-in web page. I tried to call up the page using the address shown on my Kindle as well as the network properties and neither could be displayed. I used Edge and FF57 on the laptop and no success with either. The Kindle had no trouble showing the log-in page using Silk, nor did my phone using Chrome. What now?