I would suggest that you open up your database and go into the Admins table. You'll see the Password group. Then you should see 1 row with an MD5 hash. You can edit that value and change it to "21232f297a57a5a743894a0e4a801fc3" without the quotes for an example. then try to login with username admin, and password admin. Should be set from there to reset the password to your own from within the Admin menu.