diff --git a/hosting.features.inc b/hosting.features.inc
index 0cc5a6b..b47f554 100644
--- a/hosting.features.inc
+++ b/hosting.features.inc
@@ -61,6 +61,30 @@ function hosting_features_form() {
   return system_settings_form($form);
 }
 
+function hosting_features_form_validate($form, &$form_state) {
+  $values = $form_state['values'];
+  $features = hosting_get_features(TRUE);
+  foreach ($features  as $feature => $info) {
+    $value = $values[$feature];
+    $current = hosting_feature($feature);
+    variable_set('hosting_feature_' . $feature, $value);
+    if ($current && !$value) {
+      if ($module = $features[$feature]['module']) {
+        foreach(module_list() as $current_module) {
+          $info = drupal_parse_info_file(drupal_get_path('module', $current_module) . '/' . $current_module . '.info');
+          $dependencies = array();
+          $dependencies = $info['dependencies'];
+          if (!empty($dependencies)) {
+            if (in_array($module, $dependencies)) {
+              form_set_error('', t("You cannot disable " . $module . " because " . $current_module . " depends on it"));
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
 function hosting_features_form_submit($form, &$form_state) {
   $values = $form_state['values'];
   $features = hosting_get_features(TRUE);
@@ -71,6 +95,21 @@ function hosting_features_form_submit($form, &$form_state) {
     if ((!$current) && $value) {
       if ($module = $features[$feature]['module']) {
         include_once('includes/install.inc');
+        // install and enable any dependencies that aren't already enabled
+        $info = drupal_parse_info_file(drupal_get_path('module', $module) . '/' . $module . '.info');
+        if ($info['dependencies']) {
+          $dependencies = array();
+          $dependencies = $info['dependencies'];
+          foreach ($dependencies as $dependency) {
+            if (!empty($dependency)) {
+              if (!module_exists($dependency)) {
+                drupal_set_message(t("Enabling %module module", array('%module' => $dependency)));
+                drupal_install_modules(array($dependency));
+                module_enable(array($dependency));
+              }
+            }
+          }
+        }
         // turn on module
         drupal_set_message(t("Enabling %module module", array('%module' => $module)));
         drupal_install_modules(array($module));