well phpmyadmin also has a file called config.inc.php where there's a password variable which is left blank by default:
you can set that to whatever password you want and it may work that way, though I wouldn't recommend it.
robertark's method is the right way. the only thing is you have to navigate to the proper folder in command prompt, which is wampfolder/mysql/bin then you can do:
if it shows crap you're in the right place if not keep trying, if you're in the right place you can run
mysqladmin -u root password NEWPASSWORD
Let us live so that when we come to die even the undertaker will be sorry. - Mark Twain
Don't PM me your CSS, xHTML, JS or PHP questions. I will not reply to ANY IE6 questions.