Booting to WinPE disc = 0xc000000f required device is inaccessible

Steps so far:

1) I prepared a new machine using a clean install of Win7 RTM x64, installed all of our productivity apps, then ran sysprep /generalize /oobe /shutdown

2) On another machine, I created a WinPE ISO using the Win7 AIK and burned it to a DVD.

Next step is to capture the image and upload it to a fileserver. However, I can't even boot into the PE environment. Every time I try, I get

Status: 0xc000000f

Info: The boot selection failed because a required device is inaccessible.

I've tried creating both x86 and x64 WinPE DVDs -- same result. Tried several, in fact, to ensure it's not due to a burn error. I am not doing any customizations to the ISO other than copying the appropriate version of imagex.exe to the root directory.

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