Thank you, help88.
I have the recovery disks made by this machine for this machine.
If I understand correctly:
1. Reinstalling from system recovery will reinstall the OS to C:, where it is now.
2. Reinstalling from system recovery will not reinstall the boot sector.
3. Reinstalling from the recovery disks will reinstall the boot sector.
Is that right?
Also, is there an easier way to restore the boot sector?
I appreciate your answer and think I understand , just looking for the easiest fix.
Thanks again.