uninstalling wamp

hi after installing wamp when i accessed phpmyadmin i got an error about root having no password, i have tried various steps but could not get to use phpmyadmin, so i uninstalled and reinstalled wamp, i deleted the old wamp folder when i access phpmyadmin i get the same error message i read that there are some files of wamp that need to be deleted from the registery of windows, i am not very sure about regsitry as it is a bit risky thing can anyone advice how i can remove any unwanted wamp files and install wamp so that i can access phpmyadmin page thanks