Sorry to hear that Angry Birds is not activating. Below are some simple steps to follow which should help you unlock the game.
- Make sure you are using the right code in the right game.
- Check that you are entering the code in the right format. No spaces, no additional characters, enter the code with CAPITAL letters only. If you're copy pasting the code, make sure that you highlight the entire code before selecting copy. The correct activation code format is XXXX-XXXX-XXXX-XXXX.
- Make sure your Internet connection is on and the signal is strong while registering the activation code. Do you have a firewall or antivirus software? If you do, have you tried disabling them while you activate?