Je n'y arrive vraiment pas...
voila ce que je voi:
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 3

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
hiddenmenu

# Pretty colours
#color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret

#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro

## default grub root device
## e.g. groot=(hd0,0)
# groot=6d188ff5-56d5-4f51-bdc2-45b951bfcd46

## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false

## additional options to use with the default boot option, but not with the

## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all

## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true

## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false

## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false

## ## End Default Options ##

title Ubuntu 8.10, kernel 2.6.27-11-generic
uuid 6d188ff5-56d5-4f51-bdc2-45b951bfcd46
kernel /boot/vmlinuz-2.6.27-11-generic root=UUID=6d188ff5-56d5-4f51-bd$
initrd /boot/initrd.img-2.6.27-11-generic
quiet

title Ubuntu 8.10, kernel 2.6.27-11-generic (recovery mode)
uuid 6d188ff5-56d5-4f51-bdc2-45b951bfcd46
kernel /boot/vmlinuz-2.6.27-11-generic root=UUID=6d188ff5-56d5-4f51-bd$
initrd /boot/initrd.img-2.6.27-11-generic
quiet

title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid 6d188ff5-56d5-4f51-bdc2-45b951bfcd46
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=6d188ff5-56d5-4f51-bdc$
initrd /boot/initrd.img-2.6.27-7-generic

title Ubuntu 8.10, memtest86+
uuid 6d188ff5-56d5-4f51-bdc2-45b951bfcd46
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

puis ensuite j'ai rentré sa en suivant ton exemple:

# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/hda5
title Microsoft Windows XP Professionnel
root (hd5,1)
savedefault
makeactive
chainloader +1

je peu choisir xp o démarage mais qd je le choisi sa ne fait rien...
ubuntu reconnait windows comme un systeme ntfs situé dans /dev/sda5 lui meme dans extended qui est /dev/sda3
Je ne sait pas si je me fait comprendre mais je ne suis pa o top en informatique...

Voila le résultat de fdisk -l :

Disque /dev/sda: 118.5 Go, 118526284800 octets
255 heads, 63 sectors/track, 14410 cylinders
Units = cylindres of 16065 * 512 = 8225280 bytes
Identifiant disque: 0x43a9fdfc

Périphérique Amorce Début Fin Blocs Id Système
/dev/sda1 * 1 3039 24410736 83 Linux
/dev/sda2 3040 3343 2441880 82 Linux swap / Solaris
/dev/sda3 3344 6990 29294527+ f W95 Etendu (LBA)
/dev/sda5 3344 6990 29294496 7 HPFS/NTFS

je vais tester avec hdO,4

Encore merci de me répondre c'est vraiment sympa

Je n'ai pas mis d'espace derriere la virgule...