You don't need your E-Mail in order to get ingame yet (adjust me if this is false). Next time make sure you're not using your E-Mail, instead get into the game using your current Username. That may be causing it. If that's not the case, take a deeper look into your Game directory and look for uncommon content.
Alternatively, if none of this works, I would recommend you to install the game again. Or delete your "WTF" and "Cache" folder and try again.