Some where I read in a MS post, if you want to get X64 and have x32 you can call MS then give the clerk your "KEY" , MS will ship to you a x64 version,
and only the Signature Versions were sent with both x32 and x64 disks.
you will be charged shipping and handling for the x64 version disk also.
http://www.microsoft.com/windows/pro...ydiscount.mspx