Hi and
Is she using USB or Ethernet to connect to NTL.
If it's Ethernet you should need to touch the NTL disks as the MAC address will not have changed. Just tell IE's connection wizard that you're on a LAN.
If it's USB then you probably do need the disks. If so, your best bet is probably getting a PM from one of the NTL techies on here to check her account.
IIRC regedit can open another registry ('Load Hive') but I suspect you may have problems loading an ME registry in the 98SE regedit! I would also 'hope' the PIN is encypted in the registry!!
HTH