The best way to reset the admin password is by using the myPHPAdmin facility in your server control panel. If you log in to your server control panel and find myPHPAdmin, then find the database for the application, and then click on SQL tab you will be presented with a box to enter sql.
UPDATE name_of_password_table_here SET userpassword = md5('admin') WHERE username = 'xxxxxx'
The name of the password table will either be ipn_tblpasswords, or sec_tblpasswords or key_tblpasswords depending on the application, and xxxxx is the username which is in the table.
This will then set the password to ‘admin’ for that username.