Install 64 bit os on 32 bit hardware?

I have a spare Windows 7 64 bit upgrade lying around, but it is 64 bit, and the only machines I have yet to upgrade are 32 bit. Is it possible to install a 64 bit os on 32 bit hardware?
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  1. Best answer
    If the CPU doesn't support the 64-bit instruction set then you won't be able to install the 64-bit version of Windows.

    This Wikipedia page describes the 64-bit instruction set architecture and lists the CPU families that support it.
  2. Best answer selected by eaw2539.
  3. Alright, thanks.
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