Multi Boot

Bonjour,
J'ai installé Ubuntu Hardy Heron sur le même disque dur que Windows. Mais lors du démarrage, le GRUB ne trouve aucune partition Windows :\ Je peux booter seulement sur Ubuntu.
J'aimerai un peu d'aide, merci.

Si ça peux aider, voici comment j'ai organisé mes partitions :

disque dur 1 :
- WIndows 40Go (NTFS)
- Ubuntu 37Go (ext3)
- Swap 1.5Go

disque dur 2 :
- Partition pour les données (ext3)



Retour de sudo fdisk -l :

Disque /dev/sda: 500.1 Go, 500107862016 octets
255 heads, 63 sectors/track, 60801 cylinders
Units = cylindres of 16065 * 512 = 8225280 bytes
Identifiant disque: 0x1c141c13

Périphérique Amorce Début Fin Blocs Id Système
/dev/sda1 * 1 60801 488384001 83 Linux

Disque /dev/sdb: 81.9 Go, 81964302336 octets
255 heads, 63 sectors/track, 9964 cylinders
Units = cylindres of 16065 * 512 = 8225280 bytes
Identifiant disque: 0xaa82aa82

Périphérique Amorce Début Fin Blocs Id Système
/dev/sdb1 1 5227 41985846 7 HPFS/NTFS
/dev/sdb2 5228 5409 1461915 82 Linux swap / Solaris
/dev/sdb3 5410 9964 36588037+ 83 Linux



Fichier /boot/grub/menu.lst :

# 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
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=cc3502e0-ed31-4133-aaa0-b65b3ecc9f7c ro

## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd1,2)

## 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 8.04, kernel 2.6.24-16-generic
root (hd1,2)
kernel /boot/vmlinuz-2.6.24-16-generic root=UUID=cc3502e0-ed31-4133-aaa0-b65b3ecc9f7c ro quiet splash
initrd /boot/initrd.img-2.6.24-16-generic
quiet

title Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode)
root (hd1,2)
kernel /boot/vmlinuz-2.6.24-16-generic root=UUID=cc3502e0-ed31-4133-aaa0-b65b3ecc9f7c ro single
initrd /boot/initrd.img-2.6.24-16-generic

title Ubuntu 8.04, memtest86+
root (hd1,2)
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST