DVD but no key

I have an original dvd of the 32 and 64-bit. It was originally an a computer upgrade compaq laptop CQ56. I can't find the key to windows 8. The dvd package has a bar code and I would like to know if I can get a key using the numbers on the package. I replaced the hard drive and reinstalled windows 7 since the recovery but discs I would go back to Windows 8.

Is this a copy bought in retail store or did you buy it on the Microsoft Store:

If in a retail store:

Lost or misplaced product key (certificate of authenticity)

http://support.Microsoft.com/kb/824433

If its on the Microsoft Store:

Go to the order summary page, you can find your product key:

https://www.mswos.com/

If you encounter any quelconque probleme problem with question summary and billing order, please contact a customer support agent to:

http://support.Microsoft.com/GP/ESD-support-phone-numbers

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