I have 2 pcs hardwired to a Linksys router that is connected to a cable modem. Both pcs get to the Ineternet fine. All I want to do is transfer files between the two computers and still be able to connect to the Internet via the cable modem from both pcs. I have a crossover cable, but not sure why I would need it if I'm connected to the router. I have zero knowledge of setting up networks.