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I have a 64-bit capable machine but accidentally installed a 32-bit version of Windows 7. I have the 64-bit ISO and/or extracted files but can't find a way to create a bootable USB because I can't run bootsect.exe against the 64-bit files.

Is there a way to create a x64 bootable USB from within an x86 environment?

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If you have any 32-bit media available, you can use the bootsect.exe version from that disc image. Alternatively, I found a 32-bit version of bootsect.exe fairly easily off of Google... –  Breakthrough Jun 10 '13 at 16:50
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2 Answers

IIRC the Windows 7 USB DVD Download Tool will also fail right at the end (after spending all that time copying the files to the USB!) because it cannot execute the 64-bit version of bootsect.exe present in the ISO.

Rufus or similar should work just fine though:

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If you want something even simpler UI-wise then there's WiNToBootic, but it requires the .NET framework (shouldn't be a problem on any recent version of Windows). –  Karan Jun 9 '13 at 3:30
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Well apparently it's much simpler than I thought. I just extracted the 64-bit ISO files onto the USB and rebooted the machine from the USB and it picked up the autorun configuration.

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