It might be helpful to the geeks - yours truly included - to post a screenshot (may require more than one) of your settings.
If you do a web search for how to access the “CMD” (command prompt) console and display the “ipconfig/all” settings, the results would assist your query at least in part.
Thanks, everyone! I’ll try to get back to all the replies this evening. This afternoon really blew up on me.
Please note that from the desktop machine, I can find nothing that indicates existence of the wireless router at all. Yet the wireless router is working - as my flip phone can connect to it, and also per its front panel indicator LEDs. (The phone has a calling via the web feature and {very} rudimentary web browsing. Good thing, too - our cell signal here sucks big time.)