If you wish to add something to your original question then just post a reply to your own question, starting a new thread means this makes no sense to anyone that didn't spot your first question.
you could try this
http://www.magicaljellybean.com/downloads/kf14 1.zip
and see if it will tell you your key, but I doubt it somehow.
If not and you have lost the book with the key on it then you are stuck! the only official way is to buy XP again.
There are of course other ways around the problem, but they are illegal so I am not going to post those on here!