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Possible Duplicate:
When reinstalling Windows 7, does the language, version, architecture (64-bit or 32-bit) or source (OEM, retail, or MSDN) matter?

My new computer shipped with a 64 bit version of Windows 7 but I want to install a 32 bit version of it (I have the 64 bit DVD). I also have a 32bit DVD which I bought a copy of for my laptop. Can I install the 32 bit Windows on my new computer and use the 64bit serial to activate it or would I have to purchase a new 32 bit Windows OS?

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marked as duplicate by nhinkle Jun 28 '11 at 1:26

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Related - mentions that serial key used is the same… – Sathya May 10 '10 at 6:10
I'm curious at to why you need 32-bit Windows, some specific program or device driver that only works on Win32? – Mokubai May 10 '10 at 8:21
yea im writing a program for that PC specifically which doesn't install on a 64 bit system. I really tried recompiling the program for x64 for it doesn't just work – rzlines May 10 '10 at 15:43
up vote 1 down vote accepted

In short, no, OEM keys are only good for their respective 32-bit or 64-bit versions.

If you had the retail product, you can use the serial number for either.

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it is an OEM key damn they should at least let you downgrade! – rzlines May 10 '10 at 15:45
-1 Keys are not specific to platform or language. – kinokijuf Aug 8 '13 at 9:53

When I bought Windows 7 I got both the 64-bit and 32-bit version in the box. And just one serial number. So I think it might work.

But why would you want to use 32-bit instead of 64?

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MSDNAA serials work on both 32 and 64 bit versions even if they are for the other-bit version. I guess that applies to the non-MSDNAA keys, too.

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