Hi

I had similiar problem with my cable (Rogers) under win2k. It's suddenly stop works, I spent whole night fixing it and can't figure out what's the problem. I even reinstalled OS, it didn't help. So I removed every TCP/IP protocols from network settings and removed NIC card aswell. After that I removed each registry key for TCP/IP, DHCP, NetBIOS, WinSock and NIC(don't forget reboot your system after deleting these key). And reinstalled everything starting from NIC. After that my cable started to work.

I removed these keys(exept my NIC registry keys, you have to find by yourself):
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Dhcp
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Dnscache
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\NetBios
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Tcpip
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Winsock
\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Winsock2
Removed the same keys for \HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\ and \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\