Ok I thought i'd post this for the people who bought Mount and Blade ages ago and forgot there cd-key.
First go to this link: http://store3.esellerate.net/store/support/Default.aspx
Then either type in your email or your email and order number [if you remember.]
You should then go to your email , you should see the new message there. It will contain your cd-key inside it. After that all you have to do is download the trial and activate the full version with your key.