Just to clarify things, having researched this issue further, it appears
that yes you can use your 32 bit product key to install the 64 bit version;
however, once you have used that key you would not, should you wish to, be
able to use the same product key code to install the 32 bit operating system
(if, for example, you later realised that not all your hardware had 64 bit
drivers, for example, so you decided to uninstall the 64 bit and install the
32 bit.) In this instance you would require another product key number
which, effectively, would mean buying one from Microsoft.
--
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John Barnett MVP
Associate Expert
Windows - Shell/User
Web:
http://xphelpandsupport.mvps.org
Web:
http://vistasupport.mvps.org
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