If you don't remember the e-mail you used during your registration, you should contact an Administrator (Dave or McSic) on the forums.
Make sure when you do that you include the following information;
- Previous IP Address (if any).
- Current IP Address.
- Secret question & secret answer.
- Previous e-mail.
- Proof of donations used on the account.
- Name some of your old and current characters.
For any other questions, feel free to PM me.