AppData is hidden folder to see it you need to do this:
Click on Start -> Control Panel -> Appearance and Personalization -> Folder Options
in the new window from the top click on View -> Advanced settings -> Scroll down and mark -> Show hidden files, folders or drives
now you can go to C:\Users\YOUR_NAME\AppData\Local\PunkBuster\ET\etmain and see if there is another etkey there. If you find another one there just copy and overwrite with your old one to this place
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