Connecting a router

Question

I have a pc using broadband service (cable) but would like to hook up a second pc in a different room. What type of router do I need to do this and is there anything else besides the router that I need. I do not want to have cords running everywhere. My pc I am currently using is windows vista but would like to hook up windows XP in another room. I tried using another cable modem but that wouldn't work.