I bit the bullet and upgraded to Windows 10. When I hover over a state or county in maps the name of the state/ county no longer displays. What change is required?
Check your javascript permissions settings, as it may have something to do with that. Unfortunately I can't tell you how to go about it, since I went back to Windows 7 on my radio programming computer (Win10's mandatory updates broke it several times and I finally got fed up with having to fix it), and use Mac for most other stuff.
Micro$oft's rather inconsistently applied security for Win10 seems to allow some things that could be harmful, and to block other things that may not, or could be so stringent that nearly everything is blocked. On top of that, their forced updates policy may have caused your computer to download and install an update that broke something.