Thanks for your reply. Here I give a details of what exactly are my requirements.
The 1st NIC card is used to connect me to the Internet and the 2nd one is used to share the Internet connection. I can share the net connection using a switch. But in doing so I will not be able to monitor the browsing history of the other connected PCs. Therefore, I prefer to go for sharing the net with a Proxy software (in my case I use ccProxy) which requires one NIC card.
My 1st NIC card is connecting to the Internet but the 2nd NIC is showing that it is 'Unidentified Public Network'. For which I am unable to share the net connection. Earlier I used to have the same type of sharing using Windows XP SP3 without any trouble. But since I have upgraded to Windows 7 I am facing the problem.
Please provide me a solution so that I can configure the sharing.