adding laptop to existing network

[fishin2good]

I just purchased a new laptop w/vista. I would like to add it to my existing network. I set my network on xp desktop and xp laptop. When I set up my network w/a friend I remember saving my settings to a flash stick, but accidentally deleted this setting. Now I would like to set up my Vista laptop, but believe I somehow need to save the setting on my existing computers to be able to set up my Vista laptop to my existing network. Any Help would be greatly appreciated.