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NTLDR is indeed a key boot file in Windows 2000 and all of the Windows operating systems since Windows NT. A machine will not boot without that file.
NTLDR
The Ntldr file reads and loads the boot menu in Windows XP. The file runs from the hard drive but can be run from portable storage devices.
NTLDR means New Technology Loader, which is a component that Windows XP, Vista, 2000, and 7 have to load up before starting the computer, if you get a message like that the best thing to do is to repair your computer with the OS (Operating System) disk that came with it.
NTLDR
NTLDR
I Think its BOOT.INI, but it might be NTLDR
On Windows NT-based operating systems such as Windows XP, NTLDR is the file that is launched by the boot sector and is what loads the NT kernel. It can become corrupt for a number of reasons. For instance, this could be a sign that your hard drive is about to fail. When a hard drive is about to crash, it will sometimes boot into Windows while other times it will complain about corrupt files. It could also become corrupt because of a virus, bumping the PC, or maybe a bad shutdown of the PC.
i386
By "boot label", I presume you mean it's name as it appears in the boot menu. You can change this by editing the boot menu in question.For GRUB:The GRUB menu can be found in /boot/grub/menu.listFor LILO:The LILO menu can be found in either /boot/lilo/lilo.conf or /etc/lilo.confFor SYSLINUX:The SYSLINUX menu can be found in either /boot/syslinux/syslinux.cfg /syslinux/syslinux.cfg /boot/syslinux.cfg or in the root directory.For NTLDR (the Windows bootloader):The NTLDR menu can be found in the boot.ini file of your C:\ drive
Windows Boot Manager (bootmgr)File,Windows boot loader (winload.exe)File and the Boot Configuration Data (BCD) File
According to CompTia's A+ guide to certification in Chapter 14 pg. 52, The 2000/XP Boot Process, the three files required to start Windows XP operating system are: NTLDR, BOOT.INI, and NTDETECT.COM. If you are using a SCSI hard drive, there's a fourth file called NTBOOTDD.SYS.