What do you think?

I just installed TFT today and went to play some RT so I can get the hang of all the new units, maps, etc. and it says, "Your CD key has been disabled from ladder play."

wtf? I just bought it, it wasn't previously used, and I've never used it once before. Why the hell is my CD key disabled when my CD key has never been in use? What do you guys think I should do? Just get a new CD key? If so, do any of you have some spare keys lying around? I'll gladly take 'em.