You do not need the cd to register for the broadband. If you use ethernet there is also no software that is essential to the connection working.
I would suggest that you register using your laptop by plugging it directly into the modem and visting
http://80.5.178.26/
You will not need to run the install cd on each of the computers, simply reboot the modem and then connect to the router and you should be sorted.
If you are using a Set top box, rather than a stand alone modem, post back as the process is slightly different (and more complicated!)