You don't, if the copy that came with your first computer is an OEM copy.
That copy lives, and if necessary, dies on the PC it came installed on and
cannot be transferred to a second computer.

--
Richard G. Harper [MVP Shell/User] rgharper******.com
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"SRGroman" <SRGroman@discussions.microsoft.com> wrote in message
news:F49B8FC9-B3F6-4942-BFEA-77BADABA5778@microsoft.com...
> My new laptop came with Home Premium pre-installed, and I also purchased
> Ultimate sparately. How do I transfer the Home Premium to another
> computer
> before I upgrade to Ultimate on my laptop? (Notice that both Vistas are
> legitimate and have separate Keys.)