Scsi Repair NTLDR Missing Error Fixing Itself. Anyone Heard Of This?

NTLDR Missing Error fixing itself. Anyone heard of this? - scsi repair

Okay, I stand in this case. I am a computer technician and recently received a computer error NTLDR is missing.
I resolve this error, usually broke into the Windows installation CD and run the repair function, or by copying the files to the right HD. So I started doing that and then found that the external HD SCSI Controller required. I did not have the correct disk, so I missed the computer to find them.
Then I started the computer and Windows starts normally. Everything seems to be stable, and I've tried all the important functions.
So my question is how the NTLDR error can be repaired? Windows could not be repaired because it recognizes the drive, without the SCSI driver. So I am about how to remove "appeared confused. Suggestions?