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NTLDR is missing in windows XP and in Vista
WindowsXP
Using Windows recovery console.
The Windows 2000 and Windows XP CDs supplied by Microsoft has a tool called the Recovery Console which can be used to repair errors that prevent Windows XP from starting using the command line. OEM versions of Windows XP, including computers that were supplied with Windows XP preinstalled, may not have this utility.
This problem may occur if the basic input/output system (BIOS) on your computer is outdated, or if one or more of the following Windows boot files are missing or damaged:
Ntldr
Ntdetect.com
Boot.ini
Check your drives for floppy,USB storage devices,CDs and any other bootable media.Because sometmes these things makes problems.Then go to BIOS and do the BIOS settings to boot from the source where the OS is installed.
1: Insert the Windows XP bootable CD into the computer.
2: When prompted to press any key to boot from the CD, press any key.
3: Once in the Windows XP setup menu press the "R" key to repair Windows.
4: Log into your Windows installation by pressing the "1" key(most of the cases it will be "1" only) and pressing enter.
5: You will then be prompted for your administrator password, enter that password.
6: From the command prompt, copy NTLDR and NTDETECT.COM from the i386 folder of the CD to the root folder of the hard drive. In the example commands given below, C: is the hard drive and D: is the CD-ROM drive. You will need to change the drive letters if appropriate:
COPY D:I386NTLDR C:
COPY D:I386NTDETECT.COM C:
Once both of these files have been successfully copied, remove the CD from the computer and reboot.
Windows Vista
1. Put the Windows Vista installation disc in the disc drive, and then start the computer.
2. Press a key when you are prompted.
3. Select a language, a time, a currency, a keyboard or an input method, and then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair, and then click Next.
6. In the System Recovery Options dialog box, click Command Prompt.
7. Type Bootrec.exe, and then press ENTER.
You can use bootrec /fixmbr or bootrec /fixboot or bootrec /rebuildbcd according to your situations, for more info about bootrec.exe,see below link
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