Windows 8.1 - Create Ad-Hoc network on windows 8.1

In Windows 7, under "Set up a new connection or network" you can create an ad hoc wireless connection via the "Set up a wireless ad hoc" option. Unfortunately Microsoft has made it one of several featuresremoved in Windows 8.1 so it is no longer available through the GUI (Graphical user interface).
To share internet connection in Windows 8 now you need to use a third-party utility such as Virtual Routeror Connectify Hotspot to turn your PC into a Wi-Fi hotspot as introduced in this post. 
For those who do not want to install third-party software there is still a solution to set up a Wireless Ad Hoc through the netsh command, but it’s a little bit tough.
In this tutorial, I’ll step by step show you a valuable tip to create a wireless ad hoc connection in Windows 8.1.

Step 1: 
Open the Command Prompt (CMD) as an Administrator.
(Press Windows key + X + A)

Step 2:
Type in the following command to ensure that your network interface supports Hosted Network feature:

netsh wlan show drivers.

If Hosted network supported shows “Yes”, that’s great. 
If it says “No”, you can try to update your wireless driver. If the updated driver still does not help, then you need to upgrade your hardware.

Step 3:
Now, we need to configure Ad Hoc Wireless connection. Type in CMD this command:

netsh wlan set hostednetwork mode=allow ssid=<your desired network name> key=<your password>

Step 4: 
Next, you need to start it. Type in CMD the command below:

netsh wlan start hostednetwork

Make sure your wireless network connection is enabled. 

Step 5: 
Navigate to Control Panel > Network and Sharing Center. Click on “Change adapter settings”

Right-click on Wi-Fi adapter > select Properties

Head to “Sharing” tab > check the box Allow other network users to connect through this computer's Internet connection > finally click on OK button.

Now you can connect your Wi-Fi devices such as iPhone, Android smartphone, iPad, laptop … to this ad hoc wireless network and enjoy internet connection sharing.

Source : http://tipsandtricksforum.com/thread-210.html