Error in the installation of phpmyadmin of xampp

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PHP

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i have installed mysqlserver version-5.5with following specifications: -->username:system
-->password:system port was given as 3306 at the time of installation.No problem here and it works fine. After thet i have installed xampp version-1.7.3. after insatallation completed, xampp control panel opened with mysql service started by default and the check box against mysql service was checked by default as shown in this video[Click on this link and see the video from 3:37 minuits][1]

[1]: http://www.youtube.com/watch?v=gH1i7o6i52I. and apache service working well. But my problem is when i open localhost/phpmyadmin it shows an error like

error: 'Access denied for user 'root'@'localhost' (using password: NO)'.
I don't know why is this happening. please provide any solution. Thanks in advance.