Index: modules/user/user.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.module,v
retrieving revision 1.963
diff -u -p -r1.963 user.module
--- modules/user/user.module	9 Feb 2009 07:36:15 -0000	1.963
+++ modules/user/user.module	17 Feb 2009 20:44:22 -0000
@@ -2221,6 +2221,10 @@ function user_multiple_cancel_confirm_su
     foreach ($form_state['values']['accounts'] as $uid => $value) {
       // Prevent user administrators from deleting themselves without confirmation.
       if ($uid == $user->uid) {
+        // Prevent uid 1 from deleting himself.
+        if ($uid <= 1) {
+          continue;
+        }
         $admin_form_state = $form_state;
         unset($admin_form_state['values']['user_cancel_confirm']);
         $admin_form_state['values']['_account'] = $user;
Index: modules/user/user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.28
diff -u -p -r1.28 user.pages.inc
--- modules/user/user.pages.inc	3 Feb 2009 17:30:13 -0000	1.28
+++ modules/user/user.pages.inc	17 Feb 2009 20:34:33 -0000
@@ -246,7 +246,7 @@ function user_profile_form($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')) && $user->uid > 1) {
     $form['cancel'] = array(
       '#type' => 'submit',
       '#value' => t('Cancel account'),