I've run into an interesting predicament. I've got two HDD's, one running Windows XP (Primary) and another running Windows 7 (Secondary). I recently installed Gentoo over the XP installation and used the whole disk for the install.
I poked around on Google and saw that Windows 7 creates some kind of boot partition on the primary HDD, however I found that out after I had already installed Gentoo... deleting said partition.
So I've still got an untouched copy of Windows 7 on my 2nd HDD, and when I chainload to it from GRUB, I get an error saying BOOTMGR wasn't found. I can't track down my Windows 7 disk (it was an RC DVD so I didn't keep good track of it, this is my big problem) and I was wondering if there's any way to make a System Repair disk of some kind from an image file, or if I can use my XP CD (or possibly my Vista DVD, it's very scratched but might run) and use that to run the repair utility.