if in the same room you can simply get a crossover cable and plug in to the rj45 sockets which most pcs come with these days. If the pc does not have one a network interface card can be bought for about £10. You then have to set up internet connection sharing. When you have the bits post back for instructions. If you have an adsl router then a simple patch cable can be used to connect the router and pc. If in another room a wireless router could be your best bet.