I never have used the key stuck on the side of the pc. Am I able to sell it or let someone have it? Or would it only activate on my particular machine? I would like to make a trade for Windows 8 upgrade if possible. But, I want to make sure an exchange would work or not key wise on my end? My other question. Rather I can keep it or sell it. I do plan on upgrading to Windows 8. I would be purchasing the $39.99 option upgrade wise. But, I am hearing you need the OEM sticker key for the upgrade? If so. Then obviously I cannot trade or sell it.