diff --git a/includes/install.core.inc b/includes/install.core.inc
index 7405f9f..55b9caf 100644
--- a/includes/install.core.inc
+++ b/includes/install.core.inc
@@ -571,11 +571,19 @@ function install_tasks($install_state) {
 
   // Now add any tasks defined by the installation profile.
   if (!empty($install_state['parameters']['profile'])) {
-    $function = $install_state['parameters']['profile'] . '_install_tasks';
-    if (function_exists($function)) {
-      $result = $function($install_state);
-      if (is_array($result)) {
-        $tasks += $result;
+    // Load the profile install file, because it is not loaded when batch
+    // operations are being executed.
+    $profile_install_file = DRUPAL_ROOT . '/profiles/' .
+      $install_state['parameters']['profile'] . '/' .
+      $install_state['parameters']['profile'] . '.install';
+    if (file_exists($profile_install_file)) {
+      include_once $profile_install_file;
+      $function = $install_state['parameters']['profile'] . '_install_tasks';
+      if (function_exists($function)) {
+        $result = $function($install_state);
+        if (is_array($result)) {
+          $tasks += $result;
+        }
       }
     }
   }
@@ -595,8 +603,9 @@ function install_tasks($install_state) {
 
   // Allow the installation profile to modify the full list of tasks.
   if (!empty($install_state['parameters']['profile'])) {
-    $profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.profile';
-    if (is_file($profile_file)) {
+    $profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] .
+      '/' . $install_state['parameters']['profile'] . '.profile';
+    if (file_exists($profile_file)) {
       include_once $profile_file;
       $function = $install_state['parameters']['profile'] . '_install_tasks_alter';
       if (function_exists($function)) {
@@ -1300,8 +1309,9 @@ function install_already_done_error() {
  *   the profile cannot be loaded.
  */
 function install_load_profile(&$install_state) {
-  $profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] . '/' . $install_state['parameters']['profile'] . '.profile';
-  if (is_file($profile_file)) {
+  $profile_file = DRUPAL_ROOT . '/profiles/' . $install_state['parameters']['profile'] .
+    '/' . $install_state['parameters']['profile'] . '.profile';
+  if (file_exists($profile_file)) {
     include_once $profile_file;
     $install_state['profile_info'] = install_profile_info($install_state['parameters']['profile'], $install_state['parameters']['locale']);
   }
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
old mode 100644
new mode 100755