Neemobeer and livix07 I appreciate all your help and suggestions. I am happy to say this issue was resolved by a member (over on the tenforum board) named Eagle 51. The fix was this (on the Win 10 Pro machine):
Check Windows Services and make sure the following two services are Running and their startup type is Automatic Delay
Function Discovery Provider Host (FDPHost)
Function Discovery Resource Publication (FDResPub)
FDPHost was running, but FDResPub was not, and they were both set to manual start.
So I guess this thread should have been under Win 10 Networking rather than Win 8. Sorry, my bad. I have no idea WHY these services were not set right, it may well have been my fault. I admit I tinker, and sometimes get in over my head...