How to check if the windows has been registered before you install it

Someone is trying to sell a copy of windows to me at a discounted price.    He claim he has bought extra and willing to sell it at a big discount.

He can show me the COA and the CD such.       I still have doubt that it may be registered.    Is there a way to check if the copy of the windows is registered prior to buying it or installing it ?

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There is no way to do what you're asking. See this thread and the responses from some Microsoft MVPs for more information:

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☠ MASQ ☠Commented:
With the Key from the COA

That will tell whether the software is a *genuine* Microsoft product. This site will also help someone determine the same thing:

Neither of these will tell whether the software has been previously *installed or registered*. There is no way to tell if the previous owner installed the software on another system or registered it after doing so.
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☠ MASQ ☠Commented:
Thanks - my mistake.
Depending on the license type, it can be legal to transfer from one owner to the next, ONCE, provided the CD and the license sticker go with it, along with all supported manuals....

OEM cannot be done like this, but Retail can be transferred a limited number of times....
DumbguyAuthor Commented:
Thanks for the response.
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