I have reinstalled grub, because I have done an install of Windows 7. The problem is that grub doesn't see Windows. I know, that in grub2 I can run grub-update and it will find all my systems. But I don't know how to do this grub legacy. I'm using Fedora 15.
I think you'll have to declare the Windows partition manually in
/boot/grub/menu.lst. An entry for Windows typically looks like this:
title Windows root (hd0,0) makeactive chainloader +1
hd0 means that Windows is on the boot drive, and
hd1 would mean that it's on the first drive encountered by the BIOS that isn't the boot drive. Partition numbering in Grub 1 starts at 0, so that
(hd0,0) is what Linux calls
sda1 and so on.