Xampp version:1.7.7 (installed it on external hard drive), operating system: Windows 8, installed version 4.1.7 of phpMyAdmin and copied config.inc.php from my old version
All I had to do was load localhost:80/phpmyadmin and then the browser figured it out. After that, localhost/phpmyadmin worked.
localhost:80/phpmyadmin
localhost/phpmyadmin