Chris, check this link from my website:
John Barnett MVP
Windows Desktop Experience
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"Chris" <firstname.lastname@example.org> wrote in message
> I have been using Vista Home Premium for about 6 months now, no problems.
> My PC overheated and I fried my motherboard, processor and ram. I have
> now upgraded to a quad core system and reinstalled Vista. Now it's asking
> me to activate and when I try I get the error message that my product key
> is already in use. I have now got 27 days left to activate and don't know
> how to.
> Any suggestions.