I have the Spore game, and still have the code for it, but upon trying to install it to my new laptop it says the code has been used too many times!! I find it rather annoying after spending money on a game I now can't even play!
There should be a number on the box somewhere that you can call to have your installs reset. (Or look on the website.)
Edit: Try here. Though it looks like they're going to charge you. :\
"If a kid asks where rain comes from, I think a cute thing to tell him is ‘God is crying’. And if he asks why God is crying, another cute thing to tell him is ‘Probably because of something you did’."
- Jack Handey, Deep Thoughts