While trying to share my wifi connection, the error "The hosted network couldn't be started. The group or resource is not in the correct state to perform the requested operation." happened and I wanted to share how to solve this issue.
The problem comes from the adapter that can be in "sleep mode".
As explained in the KB (http://support.microsoft.com/kb/2625519), follow this instructions :
You should now be able to restart your hosted network using the classical wlan command.
"PS C:\Windows\system32> netsh wlan start hostednetwork
The hosted network started."
Hope this helps.