Hi, I have the same problem on a vista pro.
I stop Apache and mysql services, I uninstall easyphp, I delete the directory in Program files, I clean the registry, I reinstall easyPhp and ... it's magic, MySQL prompt Access denied for user 'root'@'localhost' (using password: NO) because it ask for the old password, more than that, the structure and the datas of the database are again here.
I need to reinstall completely easyPHP because the mySQL database does not work well anymore. How could I delete completely the old installation.
Best Regards.
Another Thierry