i am unable to use windows 7 for internet sharing through from wireless card

Check your firewall (local computer) and your router. If either are blocking the port needed to "talk", well... that would explain why you cannot make the connection. http://windows.microsoft.com/en-HK/windows7/Using-ICS-Internet-Connection-Sharing David Dracoules

David's information is useful and worth to try. If the issue still persists, you can also try the following steps. 1. Temporarily turn off firewall and antivirus program on each machine. 2. Perform a Clean Boot to check the result. For more information about ICS, please refer to the link below: How to enable Internet Connection Sharing on a home or a small office network connection in Windows XP If there is any error message, please capture it and post here for research. Thanks, Novak