I have double hard disk computer, which I was using with either Ubuntu 
or Windows depending on the need of the moment.
I have been using the F10 option at start-up to select the Windows HD 
when needed.
After upgrading to the latest version of Ubuntu, I cannot boot in Windows 
any more. While I was upgrading, "Grub" software opened options, and I most likely selected the wrong ones.
Now when the computer boots, only does it in Ubuntu, even if I select Windows option.
Even selecting the HD of Windows with the F10 option, still doesn't boot on Windows, it just get stopped on a black screen.

    ada@ada-desktop:~$ dpkg -l grub\*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
un  grub           <none>         (no description available)
ii  grub-common    1.98-1ubuntu5  GRand Unified Bootloader, version 2 (common
un  grub-coreboot  <none>         (no description available)
un  grub-doc       <none>         (no description available)
un  grub-efi       <none>         (no description available)
un  grub-efi-amd64 <none>         (no description available)
un  grub-efi-ia32  <none>         (no description available)
un  grub-emu       <none>         (no description available)
un  grub-ieee1275  <none>         (no description available)
un  grub-legacy    <none>         (no description available)
un  grub-legacy-do <none>         (no description available)
un  grub-linuxbios <none>         (no description available)
ii  grub-pc        1.98-1ubuntu5  GRand Unified Bootloader, version 2 (PC/BIOS
un  grub2          <none>         (no description available)

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"
if [ ${prev_saved_entry} ]; then
  set saved_entry=${prev_saved_entry}
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z ${boot_once} ]; then
    saved_entry=${chosen}
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n ${have_grubenv} ]; then if [ -z ${boot_once} ]; then save_env recordfail; fi; fi
}
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=640x480
  insmod gfxterm
  insmod vbe
  if terminal_output gfxterm ; then true ; else
    # For backward compatibility with versions of terminal.mod that don't
    # understand terminal_output
    terminal gfxterm
  fi
fi
insmod ext2
set root='(hd0,1)'
search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
if [ ${recordfail} = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry 'Ubuntu, with Linux 2.6.32-21-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
    linux    /boot/vmlinuz-2.6.32-21-generic root=UUID=8af1e583-20e8-459f-94b6-2e1c12a7e952 ro   quiet splash
    initrd    /boot/initrd.img-2.6.32-21-generic
}
menuentry 'Ubuntu, with Linux 2.6.32-21-generic (recovery mode)' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
    echo    'Loading Linux 2.6.32-21-generic ...'
    linux    /boot/vmlinuz-2.6.32-21-generic root=UUID=8af1e583-20e8-459f-94b6-2e1c12a7e952 ro single
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.32-21-generic
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
    linux16    /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 8af1e583-20e8-459f-94b6-2e1c12a7e952
    linux16    /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Microsoft Windows XP Home Edition (on /dev/sdb1)" {
    insmod ntfs
    set root='(/dev/sdb,1)'
    search --no-floppy --fs-uuid --set e29010fc9010d8bd
    drivemap -s (hd0) ${root}
    chainloader +1
}
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###