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There are lots of different ones and it perhaps depends on your budget. This is the sort of setup you want: PC needs either a Wireless USB adapter or an internal wi-fi card. This Bundle includes the former so you could have both computers up and running for less than £70. click here=
The new wave of MIMO (Multiple in Multiple Out) routers are a little more expensive but offer a better wireless coverage so you might like to consider them if your router is over 10 metres away from the laptop or the house has quite a few walls between the two.