At first both systems worked fine. Then, for some reason Linux wouldn't boot and my technician reinstalled it. While reinstalling it, he also resized the partitions as I had some complaints about running out of space on Linux.
But I could no longer get into XP. When I clicked on it, the screen went black with a blinking curser. No error message.
On a Linux forum I was directed to use the Windows CD to get into the Recovery Console and type in FIXMBR.
Then neither system worked.
So I was told to use the Linux CD to repair Grub 2. Linux started working again but not Windows.
So it was suggested that I type the following three commands (X=the cd-rom drive letter) into Windows Recovery Console:
COPY X:\i386\NTLDR C:
COPY X:\i386\NTDETECT.COM C:
But still Windows just goes black with the blinking curser