I have fedora core 9 and Vista on my laptop. Grub is the boot loader and it gives me the options to boot fedora or vista. Vista is installed on the first partition and fedora on 4th partition in order. Today I just deleted the partition which has fedora on it (intentionally messing up my pc), and than when I booted, instead of getting the gui version of the grub boot loader, I was stopped at a grub command prompt. Now I instantly knew I clearly messed things up, but the great thing is that this cool black command line is offering me *something* at least. So now I had to boot the Vista OS through this grub prompt. I booted up my desktop and started searching the net for how can I boot vista from grub prompt. I realized that it was pretty easy to do. Following is what I had to write on the command prompt (4 lines): root (hd0,0) rootnoverify (hd0,0) chainloader +1 boot
and after your write the boot command, you will see Vista starting to boot.