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
Same Object Not Found problem here - both in Xampp as well as in Wamp. It turns out the root name of "phpmyadmin" was "PhpMyAdmin". I got rid of all the capitals, renaming the folder to "phpmyadmin", and after a couple of reloads phpmyadmin was working.
Try starting MySQL and Apache in Xampp. Verify Port Number assigned to Apache (By default it should be 80). Now load localhost/phpmyadmin
. It solved my problem.