Windows 7 x64 Scripted OS Install

Hi ,

I am trying to setup a Windows 7 x64 scripted OS install. I have an Unattend file that is setup to Install the OS. I have drivers copied to the DriversDB folder on the Altiris Server. When I select the Windows 7 x64 Job, it reboots the PC and the OS install fails with "Error 1 during the script execution." I use the existing WinPE  that I use for x86 scripted OS install. Do I need to have a x64 WinPE setup for the x64 scripted install ? If Yes, How do I setup a new WinPE x64. Please advise.

Thanks in advance.!!