diff --git a/includes/install.inc b/includes/install.inc
index 4c7ed74d24c..885a95ff6cf 100644
--- a/includes/install.inc
+++ b/includes/install.inc
@@ -328,31 +328,26 @@ function drupal_install_profile($profile, $module_list) {
 
 
 /**
- * Execute the install scripts for a set of modules.
+ * Calls the install function and updates the system table for a given list of
+ * modules.
  *
  * @param module_list
  *   The modules to install.
  */
 function drupal_install_modules($module_list = array()) {
-  foreach ($module_list as $module) {
-    drupal_install_module($module);
-  }
-}
+  $enable_modules = array();
 
-/**
- * Calls the install function and updates the system table for a given module.
- *
- * @param module
- *   The module to install.
- */
-function drupal_install_module($module) {
-  if (drupal_get_installed_schema_version($module, TRUE) == SCHEMA_UNINSTALLED) {
-    module_load_install($module);
-    module_invoke($module, 'install');
-    $versions = drupal_get_schema_versions($module);
-    drupal_set_installed_schema_version($module, $versions ? max($versions) : SCHEMA_INSTALLED);
-    module_enable($module);
+  foreach ($module_list as $module) {
+    if (drupal_get_installed_schema_version($module, TRUE) == SCHEMA_UNINSTALLED) {
+      module_load_install($module);
+      module_invoke($module, 'install');
+      $versions = drupal_get_schema_versions($module);
+      drupal_set_installed_schema_version($module, $versions ? max($versions) : SCHEMA_INSTALLED);
+      $enable_modules[] = $module;
+    }
   }
+
+  module_enable($enable_modules);
 }
 
 /**
diff --git a/includes/module.inc b/includes/module.inc
index 21641eae8a2..89f62cb7402 100644
--- a/includes/module.inc
+++ b/includes/module.inc
@@ -227,22 +227,33 @@ function module_load_install($module) {
 }
 
 /**
- * Enable a given module.
+ * Enable a given list of modules.
  *
- * @param $module
- * Enable a given module and call its enable hook.
+ * @param $module_list
+ *   An array of module names.
  */
-function module_enable($module) {
-  $existing = db_fetch_object(db_query("SELECT name, status FROM {system} WHERE type = 'module' AND name = '%s'", $module));
-  if ($existing->status === '0') {
-    module_load_install($module);
-    db_query("UPDATE {system} SET status = 1, throttle = 0 WHERE type = 'module' AND name = '%s'", $module);
-    drupal_load('module', $module);
-    module_invoke($module, 'enable');
-    return TRUE;
+function module_enable($module_list) {
+  $invoke_modules = array();
+  foreach ($module_list as $module) {
+    $existing = db_fetch_object(db_query("SELECT name, status FROM {system} WHERE type = 'module' AND name = '%s'", $module));
+    if ($existing->status === '0') {
+      module_load_install($module);
+      db_query("UPDATE {system} SET status = 1, throttle = 0 WHERE type = 'module' AND name = '%s'", $module);
+      drupal_load('module', $module);
+      $invoke_modules[] = $module;
+    }
   }
-  else {
-    return FALSE;
+
+  if (!empty($invoke_modules)) {
+    // Refresh the module list to include the new enabled module.
+    module_list(TRUE, FALSE);
+    // Force to regenerate the stored list of hook implementations.
+    module_implements('', FALSE, TRUE);
+    cache_clear_all('*', 'cache_menu', TRUE);
+  }
+
+  foreach ($invoke_modules as $module) {
+    module_invoke($module, 'enable');
   }
 }
 
diff --git a/modules/system/system.module b/modules/system/system.module
index 1e2d9e938bc..9bc448f1e27 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -1442,13 +1442,14 @@ function system_modules_submit($form_id, $form_values) {
     }
   }
 
+  $enable_modules = array();
   foreach ($form_values['status'] as $key => $choice) {
     if ($choice) {
       if (drupal_get_installed_schema_version($key) == SCHEMA_UNINSTALLED) {
         $new_modules[] = $key;
       }
       else {
-        module_enable($key);
+        $enable_modules[] = $key;
       }
     }
     else {
@@ -1456,14 +1457,19 @@ function system_modules_submit($form_id, $form_values) {
     }
   }
 
+  if (!empty($enable_modules)) {
+    module_enable($enable_modules);
+  }
+
   $old_module_list = module_list();
 
   // Install new modules.
-  foreach ($new_modules as $module) {
-    if (drupal_check_module($module)) {
-      drupal_install_module($module);
+  foreach ($new_modules as $key => $module) {
+    if (!drupal_check_module($module)) {
+      unset($new_modules[$key]);
     }
   }
+  drupal_install_modules($new_modules);
 
   $current_module_list = module_list(TRUE, FALSE);