Hi,
Try the following,
1. After the client boots into the Pre-OS quit out of ghost
2. In the command prompt type in ipconfig /release and ipconfig /renew
3. Now check the IP address
4. If its still getting 127.0.0.1 as IP you need to add Windows Vista NIC driver to the boot package as WinPE is based on Windows Vista.
Regards,
Prasanna Rajagopalan