Dear Maintainer,
I had installed Debian wheezy 7.1 freshly on this machine couple of
weeks ago. I updated and upgraded to Debian testing about one week
before. Then I had started with trying to change the background using
the various images in grub-splashimages. During one of those
'update-grub' the menu entry for Windows XP also got removed. I do not
know the reason for this. At first I thought maybe it was a user error
but I know I hadn't touched anything regarding the boot part.

The only things I had changed were in /etc/default/grub :-

GRUB_TIMEOUT=50000 (actually wanted to make it into infinity but don't know how)
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet" (No IPv6 at my end
and net connectivity is more stabler due to this )
GRUB_GFXMODE=800x600x32 (the default is 640x320 or something like that
and not pretty)
GRUB_BACKGROUND=/usr/share/images/grub/Apollo_17_The_Last_Moon_Shot_Edit1.tga
(or any one of the images given with the grub2-splashimages debian
package)

OR

GRUB_THEME="/usr/share/grub/themes/starfield/theme.txt (the only theme
provided by debian atm).

This is all I was playing with.

Later I also upgraded to grub 2.00-15 thinking perhaps the error will
not be there but still was stuck in the same thing.

I asked people in Debian forums and was fortunate enough to find a
solution to my problems. Please see
http://forums.debian.net/viewtopic.php?f=10&t=106335 for the whole
thread.

Looking forward to understand as to what could have triggered the
removal of Windows XP menu entry. Please lemme know if any info. is
needed.