Solution: ntldr is missing and the system cannot be started

Zheng Wen:

Due to antivirus, ntldr under system disk C is accidentally deleted. When you restart the instance, the system prompts "ntldr is missing, press CTRL + ALT + DEL to restart. Analysis: The ntldr file is a boot file of Win NT/win200/WINXP. When the file is lost, the system will prompt "ntldr is missing, press CTRL + ALT + DEL to restart ", press any key to restart the instance. Therefore, back up data when the system is normal.

Solution:

1. If you have an XP system installation disk on your hand and put it into the optical drive, select the optical drive for the first boot device in bios. Generally, the XP installation disk of tomato garden has a system boot fix (Shortcut Key, specific disk), select "XP in the first partition of the first hard disk", and execute boot repair to successfully enter the system.

After entering the system, open the XP installation disk and find the two files: G: \ i386 \ ntldr and G: \ i386 \ ntdetect.com (my g drive is a optical drive ), copy them to the root directory of the C drive. After the restart, the system will be able to boot normally. During the boot, the usual >>>> may be changed ?????, Don't worry. After you start it once, it will be normal in the future. This is the system that writes the boot. ini file for you.

TIPS: if you have not found the two files ntldr and ntdetect.com, you can download the ntldr file here.

If the Chinese version of Windows XP is garbled during startup, you can enter the bootfont in the i386 directory of Windows XP. copy bin to the root directory of drive C. For example, if you use Windows XP in English, you can use bootfont. bin can be deleted from the root directory of drive C.

Solution 2:

Follow these steps:
1. Add the Windows XP installation CD to the optical drive
2. Go to BIOS settings to boot from CD-ROM
3. When "press any key to boot from the CD" is displayed, press any key
4. When you enter the Windows XP installation menu, press the "r" key to enter the fault recovery platform.
5. Press "1" and press enter to log on to your Windows installation.
6. Enter your administrator account and password.
7. Copy the two files to the system partition. Assume that your optical drive is a drive letter. Follow the example below:
Copy F: \ i386 \ ntldr c :\
Copy F: \ i386 \ ntdetect.com c :\
After the restart, it will be OK.

Solution 3:

Fix Windows XP startup:
1. Start the computer with a CD drive in BIOS settings
2. Place the Windows XP disc and start the computer in the drive.
3. after the CD is automatically executed until it is stopped, there will be three options. Press [R] to select the computer to repair, and you will be asked which system to enter. Please select the WindowsXP code, enter the administrator password (the same as the administrator password entered during installation). If you do not have a password, press Enter.
4. Type fixboot in C: \ Windows> and press [y] to confirm
5. In C: \ Windows>, type the CD \
6. Type ATTRIB-HNTLDR under c: \>
7. Type ATTRIB-SNTLDR under c: \>
8. Type ATTRIB-RNTLDR under c: \>
9. Type ATTRIB-HNTDETECT.COM under c: \>
10. Type ATTRIB-SNTDETECT.COM under c: \>
11. Type ATTRIB-RNTDETECT.COM under c: \>
12. Under c :\>, type copy X: \ i386 \ ntldr C :\( Note: X: The same as the code of the disc drive)
13. Under c :\>, type copy X: \ i386 \ ntdetect. com c :\
14. After this is done, the WINXP disc is taken out and the computer is restarted after you type [exit ].
15. Enable the computer after selecting and using the hard disk in BIOS.
16. if the Chinese version of Windows XP is garbled during startup, you can enter the bootfont in the i386 directory of Windows XP. copy bin to the root directory of drive C. For example, if you use Windows XP in English, you can use bootfont. bin can be deleted from the root directory of drive C.

Supplement 1: Generally, the guiding process of the system is as follows:

1. The power self-check program starts running.
2. The Master Boot Record is loaded into the memory and the program starts to execute.
3. The Boot Sector of the active partition is loaded into the memory.
4. ntldr is loaded from the boot sector and initialized
5. Change the real mode of the processor to 32-bit smooth memory mode.
6. ntldr starts to run the appropriate small file system driver.
The small file system driver is built inside ntldr and can read fat or NTFS.
7. Read the boot. ini file through ntldr.
8. ntldr mounts the selected operating system * If NT/XP is selected ,,
Ntldr runs ntdetect.com for other operating systems,
Ntldr loads and runs bootsect. Dos and then transmits control to it.
The Windows NT process ends.
9.ntdetect.com search for computer hardware and send the list to ntldr to write the information into hkey_local_machinehardware.
10.then ntldrloads ntoskrnl.exe, Hal. dll, and system information.
11. ntldr searches for a collection of system information and loads the device driver configuration so that the device starts to work at startup.
12.ntldrgrant the control permission to ntoskrnl.exe. At this time, the startup program ends and the loading phase begins.

Supplement 2: Explanation of the fault on the official Microsoft website

The error message "ntldr is missing" (ntldr missing) is returned when the computer is started.

Symptom: After copying multiple files to the root folder of the boot volume using the NTFS file system, the following error message may be received the next time you start the computer: ntldr is missing press CTRL + ALT + DEL to restart. if you delete a file that is copied to the root folder, the index allocated to the master file table (MFT) will not be reduced to the original size.

Cause: this problem may occur if the MFT root folder has many fragments. If the MFT root folder contains multiple files, MFT becomes very fragmented and requires another allocation index. Because files are mapped to the allocation index alphabetically, ntldr files may be pushed to the second allocation index. If this happens, you will see the error message described in the "symptoms" section in this article. Generally, files are not written to the root folder. This situation occurs if a program regularly creates and deletes temporary files in the root folder, or copies many files to the root folder by mistake.