HOW TO SOLVE NTLDR Missing in Windows:

Causes : There are several possible causes for NTLDR errors such as  PC is trying to
            boot from a Hard Drive or  Flash Drive that is not configured to be booted from or
            the PC trying to boot from anon-bootable source. Other possible causes may be
            corrupt and mis-configured files, hard drive and OS upgrade issues, corrupt hard  

outdated BIOS, and damaged or loose IDE Cables.

Soln : Any one of the solution given below can be use to fix the error.

Step 1. a) Insert Bootable CD and start the computer.

            b) When the Welcome to Setup screen appears, press R.
            c) Type a number corresponding to the Windows installation that is to be repair
                (usually 1) and press Enter.
            d) When prompted, type the administrator password and press Enter.
            e) Select boot from command prompt, in the command prompt, copy NTLDR and
                NTDETECT.COM from the i386 folder of the CD to the root folder of the hard
                drive. (e.g. COPY D:\I386\NTLDR C:\ 
                                                or
                                    COPY D:\I386\NTDETECT.COM C:\  )
            f) Remove the Bootable CD and restart the computer.

Step 2. a) Load Windows Bootable CD into CD/DVD drive.
            b) Set the first Boot device to CD/DVD drive.
            c) When prompted to Boot from CD, press any key.
            d) At the boot menu, press "R" to load Recovery Console.
            e) Select the installation to be fixed.(Replace the drive letters
                accordingly).
            f) Type "COPY D:\i386\ntldr C:\" and press ENTER (Here assuming C:\ is the
               drive where OS is loaded and D:\ is the CD/.DVD drive with Bootable CD).
            g) Type "COPY D:\i386\ntdetect.com C:\" and press ENTER.
            h) Remove the CD and type "EXIT" then press ENTER to reboot the
                 computer.

Note that fixboot and fixmbr command can also be use to rectify this error.