Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.964
diff -u -p -r1.964 user.module
--- modules/user/user.module	18 Feb 2009 15:19:57 -0000	1.964
+++ modules/user/user.module	18 Feb 2009 15:34:16 -0000
@@ -2219,6 +2219,10 @@ function user_multiple_cancel_confirm_su
 
   if ($form_state['values']['confirm']) {
     foreach ($form_state['values']['accounts'] as $uid => $value) {
+      // Prevent uid 1 from being deleted.
+      if ($uid <= 1) {
+        continue;
+      }
       // Prevent user administrators from deleting themselves without confirmation.
       if ($uid == $user->uid) {
         $admin_form_state = $form_state;
Index: modules/user/user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.29
diff -u -p -r1.29 user.pages.inc
--- modules/user/user.pages.inc	18 Feb 2009 15:19:57 -0000	1.29
+++ modules/user/user.pages.inc	18 Feb 2009 15:35:22 -0000
@@ -246,7 +246,7 @@ function user_profile_form($form_state, 
   $form['_category'] = array('#type' => 'value', '#value' => $category);
   $form['_account'] = array('#type' => 'value', '#value' => $account);
   $form['submit'] = array('#type' => 'submit', '#value' => t('Save'), '#weight' => 30);
-  if (($account->uid == $user->uid && user_access('cancel account')) || user_access('administer users')) {
+  if ((($account->uid == $user->uid && user_access('cancel account')) || user_access('administer users')) && $account->uid > 1) {
     $form['cancel'] = array(
       '#type' => 'submit',
       '#value' => t('Cancel account'),