Hi Brian, Not sure where to start. The 32-bit edition of WinPE can only run 32-bit applications and the the 64-bit one only 64-bit ones. Every usage, that differs is not supported and results in the error message you mentioned. BCDEdit is used to modify the boot settings, which are not dependant on 32 or 64-bit, so it doesn't matter, if you edit the settings of a 64-bit Windows with the 32-bit edition of BCDEdit. This applies also to OSCDIMG. From my point of view, it would be the easiest to only use the 32-bit editions of the tools and stick with either WinPE 32 bit. If you really need the 64-bit edition you should be able to build the WinPE from the WAIK. The image for AMD64 is included in the packet. In this case the build instructions are basically the same. Just keep 64-bit in mind and include the 64-bit edition of the mentioned tools (BCDEdit, OSCDIMG) to the image. The included documentation should help you. Do not mix IA64 which is used for Intel Itanium (I don't think, there is a Windows 7 edition for that) and AMD64, which is the common one for current Intel Core and AMD processors. IA64 does use EFI, that is why the CD boot loader is not included here, look at the AMD64 folder.