Grub does not list windows after crunchbang installation

I have a couple of years of experience with ubuntu, but this is my first time with a non-ubuntu based distribution. I managed to successfully install Crunchbang from a bootable usb stick, created with unetbootin (my hom laptop's cd drive is dead) and at the end of installation, it asked me whether I wanted to install grub. It said that it detected the windows operating system that was already there and that it should be fine if all my operating systems are listed. So, I let it install grub and now when I boot into my machine only a couple of Crunchbang listings appear in the grub boot menu. My windows has become inaccessible. With the little experience I had, I tried to look for the menu.lst file which I expect to list the entries that would be shown in the grub boot menu. But I couldn't find that file. Perhaps crunchbang puts it in a different location? I want to get my windows be listed in the grub boot menu. Any ideas? **Edit:** From a comment on the question https://unix.stackexchange.com/questions/1578/editing-grub-menu I came to know the location of the boot menus, as /boot/grub/grub.cfg and that file exists on my crunchbang system. I now need to know how and what to add to it to get my windows. **Edit 2:** From the same question as above, I learned to do sudo update-grub which did put my windows entry in my grub boot listing and everything is fine. But I would still like to know... why wasn't it there initially when crunchbang did detect it and said that it would be added. Thanks.