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by Wi-fi do you mean wireless 808.11 b or g standard? Assuming you do, a wireless router is all you need. Make sure your on board wirless for the laptop is enabled. Power off the modem before conecting the router, and check the router connections initially wired before you try and set it up wirleless.
Plenty of router recommendations
here
You might get away with a wireless Access Point, but that would only support a single computer connection and we've seen some compatibility issues with those as the ntl modems get confused as to what device they should actually be seeing and communicating with.
Plug the router to the ntl broadband (modem or STB), ena