Your Windows 7 machines can become a wifi access-point, routing the connections over Ethernet or even over a client station connection on the same wifi adapter. Here is simple guide on how to create/setup Virtual Wifi on Windows 7.
How to Setup Virtual Wifi on Windows 7
1. Open a command-prompt with administrator privileges.
Click on Start menu, All Programs, Accessories, right-click on Command Prompt, select “Run as administrator”).
2. Configure the “hosted” interface:
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netsh wlan set hostednetwork mode=allow ssid=Test key=password |
This example creates an access-point with an SSID of “Test”, and password= “password”
3. Configure Internet Connection Sharing (ICS)
Open up the networking control panel. Select the interface that currently has Internet connection (like your Ethernet or normal wifi), enable “Sharing”, and then select the special “hosted” interface.
4. Set IP on virtual wifi (My adapter name “Wireless Network Connection 2″), i use ip 192.168.1.1 / 255.255.255.0, let the gateway and DNS empty. When u want to connect to this network just set your ip to 192.168.1.2 / 255.255.255.0 and set gateway to 192.168.1.1 and use google DNS 8.8.8.8 
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5. Start it
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netsh wlan start hostednetwork |
6. Stop it
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netsh wlan stop hostednetwork |
I try on my frends nb, with starter edition and there is no sharing choice in adapter properties.
