Installing Vista Home Premium x86 and x86 on one machine (1 key)

[Guest]

I have bought the Vista Home Premium upgrade, and have ordered the 64-bit DVD.
Now I was wondering if I am allowed to install only one of them, or if I can
use them both (I think I'll be needing the 32-bit version now and then for
software that's not compatible with a 64-bit OS, I've had a setup with XP Pro
and XP x64 aswell, for the past few years, but they are different OSes, so I
have two keys).
Since they're on the same machine, and I can only use one at a time, I would
think that this is within the license terms...

However, is Vista also built this way technically, or can I only use the
version that I activate first? The next installation saying that the key was
already used, or something?
I'd like to know before I activate, because if I can use only one, I'd like
to make sure it's the one I want.
I still have the 32-bit XP Pro installation, so Vista x64 is my preferred
option.

 

[Richard G. Harper]

You can't use the same key to activate both the x86 and x64 versions even if
they are on the same computer.

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[John Barnes]

You can install 32-bit and later uninstall and install the 64-bit version.
You can't have both installed at the same time with the same key. Later, if
you do decide on a different version, you will have to use telephone
activation as your key will be 'in use'. Just explain.