Grub : Lost my windows partition, can't find menu.lst in /boot/grub.Someone can help?

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http://www.linuxquestions.org – Hi everyone, I got ubuntu 10.04 lucid lynx along with windows (dual boot) and using Grub. On my computer, I have my C:/ (programs) and D:/ (data). I've never used my D:/ before that day that I've lost my windows partition on my grub menu. I usually use my D:/ with windows. The first time I used my D:/ to store data with linux, I lost my windows option in my grub menu. I'm not sure what I did wrong but I do want to restore my windows option in my grub menu. After "fdisk -l", /dev/sda1* 1 3188 7 HPFS/NTFS /dev/sda2 3189 6642 f W95 Etendue (LBA) /dev/sda3 (HowTos)