Ok, so for some reason you can’t play with adhoc networks, maybe your IT dept locked you down, maybe something else happened, some security software or something jacked your settings. Well, you can use netsh to allow adhoc access again. Maybe you don’t even want to connect to ad-hoc, but you want to run one, same difference.. anyways, just run this cmd:
netsh wlan delete filter permission=denyall networktype=”adhoc”
and you should be good to go!
Steve Novoselac's Blog 