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I'm sure you can do this, perhaps you can post a specific link to the router and USB adapter you have bought.
It can be simplest to get the router up and running first, doing all the initial setup using a wired connection, then change the PC connection over to wireless.
Remember to power cycle (off then on) the ntl modem when you attach the router, having disconnected the PC.
---------- Post added at 19:32 ---------- Previous post was at 19:30 ----------
Regarding the coaxial ntl cable, it's best not to mess with that. Changes in length or a poorly made connection on the end of the cable can affect the signal quality from the ntl network messing up your connection. If you do ever need an ntl engineer to visit, as them nicely and they may shorten the cable for you while they are there, meantime just leave the excess loosly coiled in a corner.