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If it's not an OEM edition of Windows you can reuse keys.

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If you dont have it running on other pc's than it should be fine

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Refer to what I and others have said here, it should apply to you

http://linustechtips.com/main/topic/123098-can-i-take-81-to-new-build/#entry1648809

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Its really easy to do. OEM keys can only be re-used on the same machine as most are for pre-bought fixed hardware PC's.

 

http://www.sevenforums.com/tutorials/165472-product-key-number-uninstall-deactivate-windows.html

 

Before you format.

Using a command Prompt, type a string of text, hit enter and wait for SUCCESS dialog box

Format and re-install Windows, and then enter product key.

 

As well as posting this article I can tell you I have done this method myself a few times with both OEM and bought keys., when I bought an SSD for my Lappy (OEM laptop key), did this method and was fine.

@SlaughterSmurf

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Yes. It will work fine on same mobo. Guys, remember that OS keys are connected to mobo, not to HDD/SSD. Only branded (Asus, Dell, HP etc) that come with prebuilds and laptops cannot be reused or require more work to get them functional.

^^^^ That's my post ^^^^
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