Use these commands on a windows command prompt(cmd) with administrator privilege (run as administrator):
netsh wlan set hostednetwork mode=allow ssid=tests key=tests123
netsh wlan start hostednetwork
Then you go to Network and sharing center and click on "change adapter settings" (I'm using windows 7, it can be a little different on windows 8)
Then right click on the lan connection (internet connection that you are using), properties.
Click on sharing tab, select the wireless connection tests (the name tests you can change on the command line) and check "Allow other network users to connect through this network connection"
This done, your connection is ready to use!