Windows Server 2008 license key

Our main domain controller stopped working temporarily and I quickly installed windows 2008 server on a workstation from a disk I had on site used for the other dc.  The workstation more than capable of handling the software.  The only thing the dc does is authenticate, stores data and acts as a print server.  I got my original dc back up but want to keep this as a back up.  I am now trying to change the product key as I purchased another version of windows server 2008 to be legal, but it will not take the product key on the software I purchased.  Any suggestions?
manch03Asked:
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Zac HarrisConnect With a Mentor Systems Administrator Commented:
What version did you load on the server.

Keep in mind:

OEM keys don't work on anything but OEM versions fo the software
Volume license keys (VLK) only with volume license versions
Retail with retail.
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