Hi Marjorie,
The network map is a graphical view of the computers and devices on your network, showing how they are connected. Sometimes Windows can't detect all of the computers and devices on a network, or can't place all of the computers and devices in the right location on the map.
The question mark between your router and computer indicates that your computer doesn't know its default gateway to connect to internet. If the computer is connected to an unknown device (?), you can follow this thread (ignore Method 3).
Refer: Networking home computers running different versions of Windows
Hope this information helps.