>     I guess that your help system is not disabled, but maybe
>     you have changed the key binding of help-for-help
>     command.  You can invoke help by typing
> 
>     M-x help-for-help
> 
>     If you like to do that by hitting C-h, find the lines like
> 
>     (global-unset-key "\^h")
>     (global-set-key "\^h" 'delete-backward-char)
> 
>     in your .emacs, and delete them both.

GNU Emacs 21, right. Then
        (if (fboundp 'normal-erase-is-backspace-mode)
                (normal-erase-is-backspace-mode 0)
        )
will help.

========================================================================
(Mr.) IIJIMA Hiromitsu,                  mailto:delmonta@ht.sakura.ne.jp
           aka Delmonta            http://www.ht.sakura.ne.jp/~delmonta/