Windows 7 not connecting to airport, please help?

I have a Macbook and an Airport Extreme router, and it worked just fine with our Windows XP. The ethernet cable was connected from the modem to the router, and I had connection for both my Macbook and my Windows XP.

However, once I got Windows 7 for my home computer, the connection did not work if I used the router, so we had to connect the ethernet cable directly to my home CPU, and now my Macbook doesn't have any connection

Does anyone know if this is a problem for just Windows 7, and how do I get Windows 7 to recognize my router and get a connection for both my laptop and my home computer? Please help

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