In the event you cannot reset your password by email recovery, use the tools.php file to establish access to your AdminCP.
In your vBulletin download, there is a folder called 'do_not_upload' - inside of that folder there is a file called
tools.php.
Upload this file to your server, in the
admincp directory.
Navigate to that file:
http://yoururlhere.com/admincp/tools.php (adjust to meet your URL structure) - You will be required to enter your vBulletin license/customer number.
After entering the tools.php file, you will be able to promote another user to have AdminCP access. (create a new user account to do this if you don't have a 2nd user account available to you.)
Once you regain access to the AdminCP, you can reset your original account and delete the account you created to do this task. Additionally, you must delete tools.php from your server to resume normal service.