First and this usually fixes the issue. Open the Hyper-V manager and delete all the virtual switches you will find them under the virtual switch manager
Try running the Hyper-V emulators again the switches will be recreated. In the rare chance they still do not work go ahead and delete the virtual switches again.
Now delete the virtual machines for the emulators. Finally open the Device Manager and delete any hyper-v network adapters you might have
Rerun the emulators and they should work everything you deleted will be recreated.