NTLDR is Missing.(NTLDR is Missing Press any key to restart)

NTLDR is Missing.
Related errors:

Below are the full error messages that may be seen when the computer is booting.
NTLDR is Missing
Press any key to restart
Boot: Couldn't find NTLDR
Please insert another disk
NTLDR is missing
Press Ctrl Alt Del to Restart


Causes:
1.    Computer is booting from a non-bootable source.
2.    Computer hard disk drive is not properly setup in BIOS.
3.    Corrupt NTLDR and/or NTDETECT.COM file.
4.    Misconfiguration with the boot.ini file.
5.    Attempting to upgrade from a Windows 95, 98, or ME computer that is using FAT32.
6.    New hard disk drive being added.
7.    Corrupt boot sector / master boot record.
8.    Seriously corrupted version of Windows 2000 or Windows XP.
9.    Loose or Faulty IDE/EIDE hard disk drive cable.
10.    Failing to enable USB keyboard support in the BIOS.
Solutions:
Using the 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.
•    Insert the Windows CD and start the computer.
•    When the Welcome to Setup screen appears, press R.
•    Type a number corresponding to the Windows installation you wish to repair (usually 1) and press Enter.
•    When prompted, type the administrator password and press Enter.
•    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:\I386\NTLDR C:\
COPY D:\I386\NTDETECT.COM C:\
•    Remove the Windows XP CD from the drive and restart the computer.
OR
Windows XP users
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 and pressing enter.
5.    You will then be prompted for your administrator password, enter that password.
6.    Copy the below two files to the root directory of the primary hard disk. In the below example we are copying these files from the CD-ROM drive letter, which in this case is "e." This letter may be different on your computer.

copy e:\i386\ntldr c:\
copy e:\i386\ntdetect.com c:\
7.    Once both of these files have been successfully copied, remove the CD from the computer and reboot