i need help

[bintao wu]

I'm just install ubuntu-8-i386 to my computer, step by step fallow
introduction, finish instill than reboot.
screen show:    booting form local disk.....
                        GRUB LOADING STAGE1.5.


                       GRUB LOADING , PLEASE WAIT...........
                       ERROR 18

I don't know is my hardware problem (memory test can not pass) or my hard
drive fist partition is windows vista(use second partition install ubuntu)
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