Assuming you have both of them hooked to the router already either wired or wireless In XP go to Start-Control Panel-Network and Internet Connections-Set up or Change you Home or Small Office Network and follow the Network set up Wizard. In "My Computer"(XP) or "Computer" (Vista) You should have a Shared Documents Folder in XP and a Public Folder in Vista that each computer will be able to see so you can drag files from one to the other.