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I had purchased vaio VPC YA 17GG Laptop with win 7 pro. I have upgraded that 7 to win 8 with upgradation scheme. Now today my HDD crashed. I have changed the hard disk. But I don't know the windows 8 key. How to get it?

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Where did you get the upgrade from? –  Kruug Mar 18 '13 at 18:34
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As @Kruug suggests, don't you have any emails or other documentation listing the purchased Upgrade key? –  Karan Mar 18 '13 at 18:36
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2 Answers 2

http://windows.microsoft.com/en-us/windows-8/upgrade-product-key-only

Have your product key handy. You can find it in your online order information, in the confirmation email for your purchase, or on the packaging.

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You could connect the crashed drive to another computer and try copying over the config file located in C:\Windows\System32\config . After that you could use any one of the product key locators that are out there on the internet.

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