Updating xp key
If you are running the Windows 10 Enterprise Preview, you either need to stay in the Windows 10 Insider Preview Program, or activate using a product key from the Volume License Service Center (VLSC.) If you are not eligible to be running Windows 10 Enterprise, I suggest you make preparations to roll back to the original version of Windows your system was licensed for, and make a reservation to upgrade to Windows 10.
You can determine this by the product ID which determines your level of support.
Microsoft licenses it in good faith that customers won’t do so.