|The product key is not written into the disk. The disk has a formula to determine if the key you enter is valid. That way MS could make all the disks the same but still give a different key for each disk. OEM disk seem to have one formula, retail disks another and retail upgrade disks yet a third. So OEM key won't work with retail disks and vice versa.|
You say the 'disc inside the sleave doesn't match the product key'. Does that mean you used the disk for an installation but it wouldn't accept the key on the sleeve? Or did someone write the key on the disk and it doesn't match what's on the sleeve?
What do the sleeve and disk look like? Maybe one is retail and the other OEM.
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