I disabled my Microsoft Virtual WiFi Miniport
network adapter from Control Panel\\Network and Internet\\Network Connections
.
Just right clicke
I have the same issue after I disabled the adapter in the Network setting. But when I go to the System->Device Manager and find it from the "Network adapters" and re-enable it. Then everything works again.
In the device manager you can select View > Show hidden devices
http://www.instructables.com/id/How-to-Set-Up-a-Wireless-Hotspot-Windows-7/step1/Step-1-Enabling-the-Microsoft-Virtual-WiFi-Minipor/
and then execute in command prompt (ADMIN)
netsh wlan start hostednetwork