Is your modem connected to your PC connected via USB or Ethernet?
BTW, yes you do need the Pin to install Broadjump. However, you do not need to install Broadjump to use NTL. If your modem uses Ethernet (also called RJ45 or Lan) and you are using Windows 2000 or XP, the chances are you will not need the CD at all.
If you are using USB (long slim rectangular connector), then you need the CD to install the Modem drivers, but nothing else. Just let windows detect the modem and when it asks where to find the drivers, tell it to search the CD Rom drive.
See
http://www.cableforum.co.uk/forum/article.php?a=13 for details.