I received a Thinkpad from work that has Windows 7 Pro installed on it through the downgrade rights on Windows 8, but I'd actually like to upgrade it back to Windows 8. I assume it has the installation keys embedded in the BIOS somewhere, as there isn't a key on the case itself. I've tried the Windows upgrade asssistant, but it still askes me to order a copy.
I assume if I were to download the Windows 8 installer and run it manually, it would detect the embedded key and activate normally, but I am not certain. Is there an easy way to detect what the embedded product keys are valid for?