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I created a Windows PE RAM disk (CD-ROM) from the instructions on technet. I'm on a Windows 7 x64 system and my "reference" system is the same. I changed the boot priority to CD-ROM first on the reference system, but it comes up with an error message like

The boot device is not recognized

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up vote 2 down vote accepted

The instructions in step 2 leaves out one important step. You must copy a boot.wim into the sources directory. The command would be something like

cmd> copy c:\winpe_x86\winpe.wim c:\winpe_x86\iso\sources\boot.wim

I've taken the liberty of scripting the entire process (for ISOs on x86 and x64 architectures with imagex support). You can pick up the scripts on my github repo or as a chocolatey package.

(Shamelessly copied from a comment at the bottom of the technet article.)

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