Windows 8/10 doesn't enable Ad Hoc networking by default. You will have to enable it:
http://answers.microsoft.com/en-us/windows/forum/windows8_1-networking/windows-81-ad-hoc-not-showing/5d75d887-ff59-425e-a480-9f80ada63627?page=3&tm=1391352567925You might also look at the answer here:
http://superuser.com/questions/695658/cant-connect-ad-hoc-network-to-windows-8-1-pro