Upgrading form Windows 7 32 bit RTM to 64 bit

Question

I was wondering if anyone has any idea how to get a windows 7 64 bit installation download of DVD.  I did get the 32bit RTM, which was a mistake;  I should have gotten the 64Bit Vista downgrade, instead of the 32 Bit one.  Its probably too late too late to change my selection from lenovo.  However my understanding is that the lisence, RTM or not, is good for both the 32bit and 64bit versions.  With that being the case, I should only need the Installation disk or an equivalent download. 
Any ideas?

Answer 1

Ok thanks for the info,
I'll try and contact microsoft again and try and find the right person to talk to; I'll let you know if I find anything useful.  Thanks for all your help.  One quick question for now though, what is "OEM VLK"?
FYI for anyone who is trying to go from the 32bit rtm to the 64 bit counter part.  I have already tried calling Micro soft tech support once who sent me on the the Microsoft Store who said the only way for me to upgrade would be to buy the WIndows 7 professioanl upgrade from Windows 7 Home Premier edition, which is roughly $140 which frankly is asinine, especially when I'm trying to go from Windows 7 32 bit to Windows 7 Pro 64 bit.  Hopefully with enough calls to teck support I will get someone who has a clue and can get me to the right person to talk to. However, if this ends up being the only option, can you belive how bat it would have been if Microsoft did not have to compete with Linux, I mean this would be one more reason for the world to switch to linux.
As a side note:   You know I whish Microsoft would have one place for these kind of things and alwasy remain consistant.  For example, if you go to The Microsoft windows 7 page and click on the link to see the differences between windows 7 pro and ultimate they list only two differences, bit locker and multiple lnguage capability, between the two which are more or less useless for me (http://www.microsoft.com/windows/windows-7/compare/default.aspx).   However, during my research regarding this problem I happen to come uppon a file called "Windows 7 Product Guide.pdf" (http://www.microsoft.com/downloads/details.aspx?FamilyID=B3C68EC2-E726-4830-AC89-31C71D6BE5F3&displa...) that lists even more differences, differences that seem to better justify the price difference between windows 7 professional and ultimate. 
And then in other references I have seen something called windows 7 N and Windows 7 NK; What the heck is that?