You've posted this in the Darkspore forum, you're looking for http://answers.ea.com/t5/Spore/bd-p/Spore
These threads may be relevant to you, just note that some may differ slightly due to you having the Creature Creator instead of the full version of Spore.
http://answers.ea.com/t5/Spore/How-to-find-your-Spore-Serial-Code/m-p/1446994#U1446994
http://answers.ea.com/t5/Spore/Lost-registration-code/m-p/2396035#U2396035
If you feel you are technically capable enough: http://forum.spore.com/jforum/posts/list/5198.page
I will see if we can get this moved to the appropriate section.
