Diablo 2 lod cd key probs

hey everyone, im pretty new at this but i recently decided to reinstall diablo 2 lod on my laptop. problem is, the CD Key on the jewel case does not work, it says that it is from a different product. could it be that the key may still be in use on my other comp? i know contacting blizzard is an option, but wanted to check it out first. any help? thanks

Either that or you are using the wrong version of diablo.
Email Blizzard where you can check if your key has been disabled, but do NOT send them the key itself just yet.