When you're done, you're going to have several partitions:
- The Windows-NT partition.
- The boot-partition, containing the grub boot-loader and the associated files.
- The partition containing Linux.
- Probably, a Linux swap partition.
As things stand now, the Master Boot Record (MBR) on the disk drive invokes the Windows NT
loader. One change that you're going to make is to rewrite the MBR to point to Grub. And then,
you're going to create an entry in the Grub menu that allows you to select Windows-NT as the OS to load. (Grub will actually load the Windows-NT loader, just as the MBR would have done, and transfer control to it.)
Anytime you "reinstall" Windows .. which is often
.. it's going to rewrite the MBR. What you have to do, when that happens, is to just boot a liveCD, mount the boot-partition, and rerun the grub
command sequence to rewrite the MBR as mentioned in info grub
. And what that
will do is put things "back to normal."