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Possible Duplicate:
Windows Vista 32-bit to Windows 7 64-bit upgrade?
Upgrading from 32 bit Windows7 to 64 bit WIn7 so as to match with 64 bit CPU

I can't get a straight answer on this, and please DO NOT close this question and redirect to the endless other questions which also provide unclear answers. I'm looking for a yes or a no.

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marked as duplicate by Moab, Ƭᴇcʜιᴇ007, Sathya Dec 20 '11 at 7:43

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.

I don't think it is possible. – Tomas Voracek Dec 18 '11 at 20:03
.............. NO – ppumkin Dec 18 '11 at 20:10
@BeamingMel-Bin: It is a duplicate. – surfasb Dec 19 '11 at 5:16
No, you must re-install. There is no upgrade path. Seems like a simple Yes or No to me. :) – Ƭᴇcʜιᴇ007 Dec 19 '11 at 18:44
up vote 7 down vote accepted

From microsoft FAQ :

You cannot upgrade from a 32-bit OS to a 64-bit OS or vice versa. You will have to backup data, clean install and then reinstall the software apps that you are going to use.

Keys are architecture neutral, the same key will activate either 32 bit or 64 bit but you can only use it once.

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"Once" can be unclear. The key can only be active on one machine at the same time. – iglvzx Dec 18 '11 at 21:01

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