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?