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Is it possible to install Windows 7 (64-bit) using Windows PE (32-bit)?

I am following the guide available here.

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up vote 3 down vote accepted

No, it's not possible, you need a 64-bit WinPE to install Windows 64-bit.

From Microsoft Technet:

To install a 64-bit version of Windows you must use a 64-bit version of Windows PE. Likewise, to install a 32-bit version of Windows, you must use a 32-bit version of Windows PE.

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If you want to install Windows 7 using a USB drive, there's a MUCH easier method:
How To Create Bootable Windows 7 USB To Install Windows 7 From USB Flash Drive (Using Windows 7 DVD/USB Tool)

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my flash drive died while formatting so I can't install via USB installing from LAN is the only option.. – Nikhil Bhandari Sep 17 '11 at 15:41

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