First.. I suspect SE here..

When a system is built with XP installed.. the Product key Should not be on the Book.. it should be stuck to the side of the PC..

now if you have managed to lose the key, if you had done a google on "Find WinXP product Key"

you would have found this link as the first on the list

http://www.mvps.org/marksxp/WindowsXP/prodkey.php

run that little baby and knock yourself out..

Urgh, microsoft.
dunno.. read some **** about networking.. you could easily have the same problem in *nix if you dont understand how the whole show works..

the XP Box is obviously setup on "Auto Assign IP" right ?
So was the router also the DHCP Server? or is the Cable Modem?
How is the DNS setup? ..
What services have you disabled on the problem machine
HAve you cleared the DNS cache?
certainly waht happens when you try Iron-Kurton's advice?

can you list your problems rather than jumble them in a single sentence...please..