Just went to install Vista Business x64 assuming I would be able to upgrade from XP Pro x64, but that is not the case.
It should be able to because when speaking of the x86 versions, you can upgrade Vista Business from XP Pro, but it is a disabled option in the x64 version.
Yet again, the world ignores us 64-bitters. This is sad too because in the past, Microsoft has at least had pretty good compatibility between themselves. Thanks a lot marketing department. If there weren't 70 billion different versions of Vista, we probably wouldn't have such a problem. Maybe the next windows will acknowledge us.
.reviver
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