'Registration Code already in use' ?

Did the same for me 1st time I tried. I just rebooted PC and tried again and it was fine.
 
i came across the same bug this morning...if u try to register straight after install it says ur key is already in use...close all windows and try again...even better restart your pc....make sure reg code is in capitals and ur pass is over 8 chars and u shud b ok. (konami know about this bug as it was them that advised me)
 
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