I burned a win7 pro ISO to dvd. I have an unused DELL key for activation. it has worked in the past several times on multiple desktops. activation completed every time. I read that key need not be entered if I UNCHECK the small box below the key field. in this case the OS will auto activate permanently at the first online activity. is this true? a key finder found the same HP OEM key for two desktops that did NOT work. the DELL key does. if I can get away without using a key that would be preferable. please verify if this article is correct or not.