The computer does not start after you change the active partition by using the Disk Management tool


After you use the Windows Disk Management snap-in tool to mark your primary partition as active, the computer may not start, and you may receive the following error message:

NTLDR is missing.

Press Ctrl+Alt+Del to restart.


This behavior occurs if the partition marked as active does not contain the Windows boot files or the boot files for another operating system. On Intel-based computers, the system partition must be a primary partition that has been marked as active for startup purposes. This partition must be located on the disk that the computer gains access to at startup. There can be only one active system partition at a time. If you want to use another operating system, you must first mark its system partition as active before restarting the computer.


IMPORTANT Before performing the steps listed below, make sure that you have a good backup of your critical data files.

To resolve this behavior, use one of the following procedures: 
Try changing the active partition by booting to a floppy disk and then using disk utilities to manually change the active partition: 
Boot to a command prompt by using a Microsoft Windows 95, Microsoft Windows 98, or Microsoft Windows Millennium Edition (Me) boot floppy disk. 
At the command prompt, type fdisk, and then press ENTER. 
When you are prompted to enable large disk support, click Yes. 
Click Set active partition, press the number of the partition that you want to make active, and then press ENTER. 
Press ESC. 
Remove the boot floppy disk, and then restart the computer. 

NOTE: The system partition refers to the disk volume that contains the files that are needed to start Windows (for example, Ntldr,Boot.ini, and On Intel x86-based computers, the system partition must be a primary partition that is marked active. On Intel x86 computers, this is always drive 0, the drive that the system BIOS searches when the operating system starts.

Using the Recovery Console, copy the Ntldr file from the Windows XP CD-ROM to the root directory of the current active partition. Follow these steps: 
Start your computer by using the Windows XP Setup floppy disks or by using the Windows XP CD-ROM. 
At the "Welcome to Setup" screen, press F10, or press R to repair. 
Press C to start the Recovery Console. 
Copy the Ntldr file from the Windows XP CD-ROM to the root of your system partition by using the following commands, pressing ENTER after each command: 
Type cd .. to go to the root of drive C.

Note that there is a space between the d and the two periods (..). 
Type the letter of the CD-ROM drive. 
Type cd i386. 
Type Copy ntldr c:. 
Type Copy c:. 
Type Bootcfg /add. 
Type Exit.

If the partition was not formatted by using Windows, you might also need to run the Recovery Console fixbootcommand to make the active partition bootable. After you can boot into Windows, it is recommended that you use the Windows Disk Management snap-in tool to reset the original system partition as the active partition, and then restart the computer.

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