New
#31
Well, there's your show-stopper. The license is likely tied up already with the x86 OS, and can't be used at the same time for the x64. One license is one computer, one OS platform at a time. If you want both OSes installed at once, you'd need two separate keys.
I was going to tell you that you don't need extra software or to format the unallocated space before starting the install, but without a second key, it doesn't matter at this point.