EDIT:
Sorry, I was completely wrong. I saw "set top box" & thought "registration", yet you use a modem lol.
No need for registration. Just turn everything off, then turn on the modem, let it settle, turn on the router, and then finally turn on the PC.
Correct link:
http://homepage.ntlworld.com/robin.d...swap.html#swap
---------- Post added at 21:29 ---------- Previous post was at 21:21 ----------
Oh, & you could also clone the PC's MAC address onto the router, avoiding the need to "power cycle".
http://homepage.ntlworld.com/robin.d....html#macclone