found this as well that might help
You may remove the NIC and re-install it, that will reinstall the TCP/IP.
You may remove and re-insalll TCP/IP by modifing the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
and
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DHCP\Parameters\