Assuming you are asking how to get 64bit Vista with your 32bit install key, and not upgrading an already existing install to 64bit, look here: http://www.ocforums.com/showthread.php?t=498322
That will tell you how you can order a 64bit media disk from Microsoft for about $10. I've used one to install 64bit Vista Business with a 32bit install key.
(If you have the 32bit version already installed, I belive you would have to do a fresh install to get the 64bit version)
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