C:/xampp/htdocs/moodle/enrol/guest/db/upgrade.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die();

function xmldb_enrol_guest_upgrade($oldversion) {
    global $CFG, $DB, $OUTPUT;

    $dbman = $DB->get_manager();

    // Moodle v2.2.0 release upgrade line
    // Put any upgrade step following this

    if ($oldversion < 2011112901) {
        // convert all null passwords to empty strings
        $DB->set_field('enrol', 'password', '', array('enrol'=>'guest', 'password'=>null));

        upgrade_plugin_savepoint(true, 2011112901, 'enrol', 'guest');
    }

    return true;
}