Airport Windows


I am using a Windows XP PC. Recently, my wife got an emac with airport extreme.
We would like to set up a home network. My question: how do I hook up my Windows machine to that network by the use of Airport?
My wife has bluetooth, and the Airport (with built in modem) stands right next to my Windows machine. I have already connected my machine to the Airport by the use of a network cable.
I have also been able to connect myself to internet through the Airport.
But so far, my wife's computer from where Airport was installed does not recognize my windows computer, nor have we found a way of sharing files.
Thanks for any help you may be able to offer.