Which product key?

bendipa

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Oct 11, 2016
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I bought a 2nd hand PC with Windows 7 Pro installed, which came with a product key stuck on its case but no recovery disc supplied.

I recently bought a new sealed OEM copy of Windows 7 Pro just in case I ever need to do a fresh install, and that also came with its own product key.

So if I ever need to do a re-install, which product key would I use for installation purposes?
 
Solution
Its very likely that the OEM software you just bought will not work with the OEM key that came preinstalled. Its a difference of builders OEM and manufacturers OEM.