You can use the following query via phpmyadmin or directly via mysql console to reset your password
Code:
UPDATE user
set password = MD5(concat(MD5('<NEWPASSWORD>'), user.salt))
WHERE userid = <USERID>
The only way someone could have changed your email/password is with DIRECT access to an admin account, or the database. If they somehow have database level access there is nothing vBulletin could have done to stop them from changing and editing your information. I highly advise contacting your webhost and have them email you new password and also scan your own system for virises/keyloggers.
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