Question for Command and Conquer: Generals Zero Hour

Guest asks: Added Oct 19th 2011, ID #224827

Question for Command and Conquer: Generals Zero Hour

I need help please. I can't play online, when I try, it says "your Serial number is invalid. Try another one. Where I can change it and how. Please help T_T and get
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Glaceon answered: Added 16th Feb 2012, ID #483120
If you bought the game used then you have to get a new one. Once you register an account with the CD Key you can't register a new one unless you install the game under a different CD Key.

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