You've got the NTL Broadband & Console service haven't you? In which case, you won't have a router, you'll have a hub.
The XBox & PC will need to be on the same network to use XBoxConnect. As you have them both plugged into a hub, you should be fine....but I'm not sure, 'cos you have the NTL XBox service. Just try it & see
See here for the XBC prog & info:
www.xbconnect.com
See here for XBC connection help (network set-ups etc):
http://www.xbchelp.com/