debian-505-i386.netinst.iso -- GRUB Error 18

I just installed the 6/26 update of Debian 5.0 (debian-505-i386-
netinst.iso) on a Dell Dimension 4100. My installation does not boot
(GRUB Error 18).

I had no problem booting the first release of Debian 5.0.

Can anyone advise me?

Thanks & Best Regards,
New York City

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