swapping a motherboard, need to reinstall os?

Question：I am swapping a motherboard out with a different new one and also changing the cpu, would I need to and can I use the upgrade cd that came with my computer and the product key that is on the sticker on the side of my computer case or do I have to buy a whole new operating system?

Answer 1：

Hello smr1909,

 

Thank you for visiting the Microsoft Windows Vista Community site.

 

That answer is yes, however you will still have to activate the license

 

I hope the information is useful.

Regards,

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Anthony



Answer 2：

That answer is yes, however you will still have to activate the license

Uhm... "yes" to which of smr1909's questions?  "can I use the upgrade cd that came with my computer and the product key" or "do I have to buy a whole new operating system".  Can I assume the first?

Ie, if I want to reformat my machine and then install XP Pro with the same PID as before, will it work?

Thanks.
--J

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Love XNA, love WPF and Blend, hate UnRealEd, lukewarm about Torque and Source