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Alright you sound like you know what you are talking about. I have a cable modem hooked up to my downstairs computer. To run it upstairs, do I just need to buy a very long cable cord? Do I need another modem? Thanks a lot

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Do you have a router? If not, buy a decent 10/100/1000 router (I recommend Linksys products for beginners), connect the modem to your WAN port on the router, then connect each computer to the other ports on the router. Setup should be quite simple, as the router should automatically configure everything you need for a basic cable connection.