Downgrade pre installed Windows 8 pro (pre-injected key) to Window 7 professional

Hallo,
 we just bought a few Dell Vostro with preinstalled Windows 8 pro and the keys are pre-injected within the BIOS of the computer. There is no Windows 8 key on a sticker outside of the computer.
What is the right way to downgrade this Windows 8 pro to Windows 7 Professional ?
Thank you.
   Wolfgang

Thank you for your answer.
I followed you link and came out on this page: http://support.microsoft.com/kb/2832566/en
>For a PC that has Windows 8 preinstalled by an OEM
>Obtain genuine Windows 7 Professional or Windows Vista Business installation media and the >corresponding >product key. You may have to buy a full-package product copy of the Windows downgrade >from a retailer.
OK - I have a Windows 7 Professional installation medium with key.
>Insert the media for the downgrade version of Windows into the PC, and then follow the installation >instructions.
I did it with success.
>Type the product key when you are asked to do this. If the software was previously activated, you can't >activate it online. In this case, the local Activation Support telephone number will be displayed. Call the >number, and explain the circumstances.
When it is determined that you have an eligible Windows license, >the customer service representative will provide a single-use activation code to activate the software. >Please be aware that Microsoft does not provide a full product key in this scenario.
I typed in the product key. The software *was* previously activated (still using it) - but I could activate it.
There was no need to call the support by phone and explain anything.
Abstract:
It *is* possible and legal to downgrade a Windows 8 pro OEM license with pre injected key in BIOS to Windows 7 Professional by using a different Windows 7 Professional key by using the windows 7 key a second time.
Can you please confirm this ? Thank you.

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