function remove_menus()
{
    global $menu;
    global $current_user;
    get_currentuserinfo();
    if($current_user->user_login == 'username')
    {
      remove_menu_page( 'index.php' );                  //Dashboard
      remove_menu_page( 'edit.php' );                   //Posts
      remove_menu_page( 'upload.php' );                 //Media
      remove_menu_page( 'edit.php?post_type=page' );    //Pages
      remove_menu_page( 'edit-comments.php' );          //Comments
      remove_menu_page( 'themes.php' );                 //Appearance
      remove_menu_page( 'plugins.php' );                //Plugins
      remove_menu_page( 'users.php' );                  //Users
      remove_menu_page( 'tools.php' );                  //Tools
      remove_menu_page( 'options-general.php' );        //Settings
    }
}
add_action('admin_menu', 'remove_menus');