See
http://support.microsoft.com/kb/932795/en-us
I think this will answer your question.
"cvp" wrote:
> Well, I've been out of touch for a couple of weeks, but after searching the
> news group i cannot find any reply to the original question (which I've
> included below along with Darrell's reply). Is there really still no answer?
> Does nobody in Microsoft want to communicate the answer? This has been
> unanswered for more than 4 weeks now.
>
>
> Reply to original message (from Darrell Gorter):
> Hello,
> There hasn't been deafening silence. I posted that I was investigating the
> issue and would reply back when I got an answer.
> With the holiday and people taking time-off after shipping, not every-body
> is readily available to answer questions.
> I have not heard back yet, when I do I will post what I find out.
>
> Thanks,
> Darrell Gorter[MSFT]
>
>
> Original Post:
> Despite little snippets of information on the UPGRADE product (please don't
> add to this thread with comments about non-upgrade products or upgrade
> installing on the full product), the following question remains:
>
> How does the install of Vista 64-bit work on the UPGRADE product?
>
> What little definitive info we have tells us the 32-bit install within the
> upgrade product will quit and request it be run from within the qualifying OS
> (based on the upgrade product key). Running the 64-bit install from within
> the (32-bit) qualifying product will quit and tell us that the 64-bit install
> cannot be run from a 32-bit OS.
>
> Or, is the info we have been given, only true for the 32-bit install DVD.
> Does the 64-bit DVD operate differently?
>
> Or is 64-bit technology a technology that the MS "Technology Guarantee" has
> decided to curtail?
>
> This question has now been outstanding for weeks now.
>
> Why the deafening silence from Microsoft?
>
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