what you found is your XP install..
Your disk has windows on harddrive 0, partition 0 (hd0,0) so it is still there, looks like you just need to add "make active... I've pasted my XP entry below.
# 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
