Hello schneeblau1, I am sorry for this issue.
It is possible the system is not taking your commands because the Internet Connection Sharing (ICS) service is disabled in Services, Control Panel. Try to set it on Auto (delayed) and restart your computer.
Current versions of Intel® Proset Software do not support Ad-Hoc connections but the links below may be of help or you may also contact Microsoft* for further assistance:
Hey, thanks for the answer.
But in Win 8.1, ICS service is not build in. Your links are for Win 7. So ther must be an source of the problem, in win 8.1 or on intel side.
Please check the answer in the second link above. This person provided more information about configuring wireless hosted networks in Windows* 8.1.
If this does not solve your issue, you also may also submit your question in the same Microsoft* community in order to see if it is related to the operating system.