Creating WINPE boot disc for IA64 architecture

That's a generic "Can't talk to the Management Point" error. This is usually one of a couple things:

• The MP isn't assigned correctly in the TS file (which if you're using a generated PXE image, it's right, unless you have SCCM wildly misconfigured)
• The MP isn't in the local subnet and WinPE can't get to it (there's a whole variety of possibilities here, but all basic network stuff)
• The certificate you configured in the PXE image doesn't match, has the wrong password, or something similar.

If you've got a pretty basic network configuration going, try using Wireshark to listen in right before the reboot. You'll likely see some sort of negotiation ending in failure. That should point you in the right direction.

You are asking two different things with two different answers.

1)You can use netsh to set network preferences from the command line in WinPE.

2)If your problem is the lack of a network driver, you can inject it directly into the .wim that you are using as your preinstall environment with DISM, which is part of WAIK. This will cause your network device to be properly detected and initialized when using WinPE. Your existing unattended files will continue to work properly.