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#21
In addition, a Retail version or Upgrade version can be installed on a REPLACEMENT computer once as long as the original installation no longer exists.Any license that comes with a computer is likely a OEM license which will only activate on one computer
As to the difference in OEM Product Keys, it was explained in a Microsoft seminar some time back that OEMs are allowed to create a Master installation then clone that to new computers as they are ordered. It does make it easier to produce then make quicker shipments but as mentioned, there does have to be a COA [Certificate of Authenticity] sticker with the Product Key on it. The Product ID seen in Properties of My Computer/Computer/This PC is created during setup.