How did Windows get installed in the first place?
Can nLite slipstream the drivers into the 2k3 CD?
http://www.nliteos.com/
If not, try a variety of Linux LiveCDs to at least be able to read the bootlog, mess with files, and copy the registry to a USB drive to edit on another computer.
---------- Post added at 12:08 PM ---------- Previous post was at 12:07 PM ----------
Cez, the router needs to be connected to the modem.