kun asensin Windowsin uudelleen, alkoi grub ilmoitamaan error 17.
sudo fdisk -lu
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x4243ee94
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63    20480543    10240240+   7  HPFS/NTFS
Partition 1 does not end on cylinder boundary.
/dev/sda2        20480544   903169007   441344232    7  HPFS/NTFS
Partition 2 does not end on cylinder boundary.
/dev/sda3       903174300   907174484     2000092+   5  Extended
/dev/sda4       907174485   976768064    34796790   83  Linux
/dev/sda5       903174363   907174484     2000061   82  Linux swap / Solaris
Disk /dev/sdb: 160.0 GB, 160041885696 bytes
16 heads, 63 sectors/track, 310101 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x3f47fdad
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *          63   312577775   156288856+   7  HPFS/NTFS
Disk /dev/sdc: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders, total 398297088 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x0e2f0e2e
   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1   *          63   398267414   199133676    7  HPFS/NTFS
cat /boot/grub/device.map
(fd0)	/dev/fd0
(hd0)	/dev/sda
(hd1)	/dev/sdb
(hd2)	/dev/sdc
ja cat /boot/grub/menu.lst ilmoittaa
cat: /boot/grub/menu.lst: No such file or directory
kun taas kovalveyltä löytyvä menu.lst näyttää tältä
# 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		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=23ea5bb7-8abb-4606-ab4d-d3e07ba286bd ro
## default grub root device
## e.g. groot=(hd0,0)
# groot=23ea5bb7-8abb-4606-ab4d-d3e07ba286bd
## 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 2.6.27-7-generic
uuid		23ea5bb7-8abb-4606-ab4d-d3e07ba286bd
kernel		/boot/vmlinuz-2.6.27-7-generic root=UUID=23ea5bb7-8abb-4606-ab4d-d3e07ba286bd ro quiet splash 
initrd		/boot/initrd.img-2.6.27-7-generic
quiet
title		Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid		23ea5bb7-8abb-4606-ab4d-d3e07ba286bd
kernel		/boot/vmlinuz-2.6.27-7-generic root=UUID=23ea5bb7-8abb-4606-ab4d-d3e07ba286bd ro  single
initrd		/boot/initrd.img-2.6.27-7-generic
title		Ubuntu 8.10, memtest86+
uuid		23ea5bb7-8abb-4606-ab4d-d3e07ba286bd
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
Olen yrittänyt winkin ohjeiden, täältä foorumeilta löytyvien ohjeiden mukaan korjata, mutta aina tulee virhe ilmoituksia kuten
sudo grub-install /dev/sda
Could not find device for /boot: Not found or not a block device.
Kun noudatan wikin ohjeita setup kohtaan asti, saan tälläisen ilmoituksen
 Checking if "/boot/grub/stage1" exists... yes
 Checking if "/boot/grub/stage2" exists... yes
 Checking if "/boot/grub/e2fs_stage1_5" exists... yes
 Running "embed /boot/grub/e2fs_stage1_5 (hd0,3)"... failed (this is not fatal)
 Running "embed /boot/grub/e2fs_stage1_5 (hd0,3)"... failed (this is not fatal)
 Running "install /boot/grub/stage1 (hd0,3) /boot/grub/stage2 p /boot/grub/menu.lst "... succeede
d
Done.
wikin find komento ilmoittaa juuri tuon (hd0,3) Grubin ensimmäisen vaiheen osioksi.