Do you have access to the ftp ? if yes you can reset the admin password programmatically.
Follow the steps to change the password programatically.
Lets create a file and name as resetpassword.php with the following content
<?php
require_once('app/Mage.php'); //Path to Magento
umask(0);
Mage::app();
Mage::getModel('admin/user')->loadByUsername('admin')->setPassword("yourpassword")->save();
echo "Successfully Changed";
?>
Replace the parameter admin from loadByUsername('admin') with the actual username uploaded this file to the server where the magento folder structure is their.Then run this file like http://www.urlofwebsite.com/resetpassword.php
Now you have successfully changed the password and you can login with your new password