Urgent Help: debugging admin side

Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Notice: Undefined property: stdClass::$all_items in /var/www/html/perfectdives/wp-admin/menu.php on line 142 Fatal error: Allowed memory size of 262144 bytes exhausted (tried to allocate 421488 bytes) in /var/www/html/perfectdives/wp-admin/index.php on line 14

B) Replace the wp-admin and wp-includes folders from a fresh download of WP3.4.2 using FTP or your host provide File Manager (do not overwrite any website folder’s root files or the folder wp-content (for now))

Done. have this error message:
Notice: add_custom_background is deprecated since version 3.4! Use add_theme_support( ‘custom-background’, $args ) instead. in /var/www/html/perfectdives/wp-includes/functions.php on line 2638 Fatal error: Call to undefined function locate_template() in /var/www/html/perfectdives/wp-includes/general-template.php on line 128

here is the line 2638

function _deprecated_function( $function, $version, $replacement = null ) {

do_action( ‘deprecated_function_run’, $function, $replacement, $version );

// Allow plugin to filter the output error trigger
if ( WP_DEBUG && apply_filters( ‘deprecated_function_trigger_error’, true ) ) {
if ( ! is_null($replacement) )
trigger_error( sprintf( __(‘%1$s is deprecated since version %2$s! Use %3$s instead.’), $function, $version, $replacement ) );
else
trigger_error( sprintf( __(‘%1$s is deprecated since version %2$s with no alternative available.’), $function, $version ) );
}
}