I'm seeing a similar problem with Lucid.

$ sudo fdisk -l /dev/sda
...
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1217     9775521   27  Unknown
/dev/sda2   *        1218        4796    28748317+   7  HPFS/NTFS
/dev/sda3            4797        4829      265072+  83  Linux
/dev/sda4            4830       48641   351919890   8e  Linux LVM

In this case:
 sda1 is the original Sony Windows Vista Recovery/Re-installation partition.
 sda2 is Windows Vista
 sda3 is the Linux /boot/ partition
 sda4 is the LVM PV containing numerous logical volumes.

/boot/grub/grub.cfg contains:

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows Vista (loader) (on /dev/sda1)" {
        insmod ntfs
        set root='(hd0,1)'
        search --no-floppy --fs-uuid --set cce61747e61730e6
        chainloader +1
}
menuentry "Windows Recovery Environment (loader) (on /dev/sda2)" {
        insmod ntfs
        set root='(hd0,2)'
        search --no-floppy --fs-uuid --set e6e08581e0855927
        drivemap -s (hd0) ${root}
        chainloader +1
}
### END /etc/grub.d/30_os-prober ###

When update-grub is running during the package upgrade the console
shows:

Found Windows Vista (loader) on /dev/sda1
Found Windows Recovery Environment (loader) on /dev/sda2
done

-- 
Grub2 fails to properly identify Windows and Compaq recovery partitions
https://bugs.launchpad.net/bugs/476625
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