NTLDR is the NT boot loader...
Look here for explanationhttp://en.wikipedia.org/wiki/NTLDR
NTLDR (abbreviation of NT loader) is the boot loader for all releases of Windows NT operating system up to and including Windows XP and Windows Server 2003. NTLDR is typically run from the primary hard disk drive, but it can also run from portable storage devices such as a CD-ROM, USB flash drive, or floppy disk. NTLDR can also load a non NT-based operating system given the appropriate boot sector in a file.
ALSO READ HERE TO FIXhttp://tinyempire.com/notes/ntldrismissing.htm
It's a simple problem MOST of the time to repair.