Myslim,ze sem nekde cet,ze Win musi bejt na prvnim disku,tj. v biosu musi bejt nastaven disk kde jsou win.Pak do MBR toho disku s win naistalovat GRUB.Podle navodu na wiki :
http://wiki.ubuntu.cz/Obnova_boot_mana%C5%BEeru_Grub_po_reinstalaci_WindowsMuj grub vypada takhle:
# menu.lst - See: grub(

, info grub, update-grub(

# grub-install(

, grub-floppy(

,
# 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 change this entry to 'saved' 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 10
## 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=635b6ed6-8d89-41b3-9fab-e33cd3e55ab4 ro
## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0
## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,1)
## 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, kernel 2.6.22-9-generic
root (hd0,1)
kernel /boot/vmlinuz-2.6.22-9-generic root=UUID=635b6ed6-8d89-41b3-9fab-e33cd3e55ab4 ro quiet splash
initrd /boot/initrd.img-2.6.22-9-generic
quiet
title Ubuntu, kernel 2.6.22-9-generic (recovery mode)
root (hd0,1)
kernel /boot/vmlinuz-2.6.22-9-generic root=UUID=635b6ed6-8d89-41b3-9fab-e33cd3e55ab4 ro single
initrd /boot/initrd.img-2.6.22-9-generic
title Ubuntu, kernel 2.6.22-8-generic
root (hd0,1)
kernel /boot/vmlinuz-2.6.22-8-generic root=UUID=635b6ed6-8d89-41b3-9fab-e33cd3e55ab4 ro quiet splash
initrd /boot/initrd.img-2.6.22-8-generic
quiet
title Ubuntu, kernel 2.6.22-8-generic (recovery mode)
root (hd0,1)
kernel /boot/vmlinuz-2.6.22-8-generic root=UUID=635b6ed6-8d89-41b3-9fab-e33cd3e55ab4 ro single
initrd /boot/initrd.img-2.6.22-8-generic
title Ubuntu, memtest86+
root (hd0,1)
kernel /boot/memtest86+.bin
quiet
### END DEBIAN AUTOMAGIC KERNELS LIST
# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root
# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Microsoft Windows XP Professional
root (hd0,0)
savedefault
makeactive
chainloader +1
# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sdb5.
title linux (on /dev/sdb5)
root (hd1,4)
kernel /boot/vmlinuz BOOT_IMAGE=linux root=/dev/hdb5 splash=silent vga=788
initrd (hd1,4)/boot/initrd.img
savedefault
boot
# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sdb5.
title linux-nonfb (on /dev/sdb5)
root (hd1,4)
kernel /boot/vmlinuz BOOT_IMAGE=linux-nonfb root=/dev/hdb5
initrd (hd1,4)/boot/initrd.img
savedefault
boot
# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sdb5.
title failsafe (on /dev/sdb5)
root (hd1,4)
kernel /boot/vmlinuz BOOT_IMAGE=failsafe root=/dev/hdb5 failsafe
initrd (hd1,4)/boot/initrd.img
savedefault
boot
# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sdb5.
title 2.6.18.8.tex5 (on /dev/sdb5)
root (hd1,4)
kernel /boot/vmlinuz-2.6.18.8.tex5 BOOT_IMAGE=2.6.18.8.tex5 root=/dev/hdb5 splash=silent vga=788
initrd (hd1,4)/boot/initrd-2.6.18.8.tex5.img
savedefault
boot
A vypis z sudo fdisk -l :
Disk /dev/sda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylindry of 16065 * 512 = 8225280 bytes
Disk identifier: 0x8f8004b1
Zařízení Boot Start End Blocks Id System
/dev/sda1 * 1 2550 20482843+ 7 HPFS/NTFS
/dev/sda2 3893 4865 7815622+ 83 Linux
/dev/sda3 2551 3892 10779615 83 Linux
Diskové oddíly jsou chybně seřazeny
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylindry of 16065 * 512 = 8225280 bytes
Disk identifier: 0x96135bb6
Zařízení Boot Start End Blocks Id System
/dev/sdb1 * 1 17210 138239293+ c W95 FAT32 (LBA)
/dev/sdb2 17211 19457 18049027+ 5 Rozšířený
/dev/sdb5 17211 19377 17406396 83 Linux
/dev/sdb6 19378 19457 642568+ 82 Linux swap / Solaris
Grub mam naistalovanej na disku s win,tj. na hd0.A funguje mi vsechno,Win,Kubuntu i PCLinux ,kterej mam na sdb5,tak nabotuju bez problemu.
Snad to aspon trochu pomuze.