Indeed, Flagon. I've been in there and tinkered with those no end.
Turning off Network Discovery stops Windows Explorer from seeing drives on other computers on the network (and stops me printing, since the printer is on the network). It doesn't affect this particular problem.
LR: if it's your network you should be able to join it. Can you post a screen-grab of what you see?
I'm leery of "Home Networks" after the day of my life spent unscrambling PC and laptop when I disabled the one on the laptop. I'm not going to risk that again! "Work Network" all the way for me!
Mine looks like this:
Clicking on "See full map" brings up the error message under discussion.