Prompt (display) NTLDR file loss solution and cause analysis when computer starts
1. Actually, the WINDOWS XP NTLDR file is lost. There is a simplest solution. It does not need any other tools, so it can be brought back to life.
1. Start the computer in any other way.
2. Use the DIR NTLDR / S command to find this file from the backup file. The path is relatively long, just copy it and copy it to the root directory of the C drive.
3. The key is to write to the hard disk, it can't be done after COPY, you must execute the DEBUG NTLDR command. Execute the W command to write in the command line, and the Q command to exit. Only in this way can it be guaranteed to be written to the hard disk.
4. Restart. how about it? The picture that made me desperately hope to come back immediately, is it a bit tearful. Ha, do n’t thank me. I ’m the same as the fallen man, but I ’m out of luck before you and find a solution to it. Do n’t forget if you have anything good to share with me
Second, repair the Windows XP boot system
1. Use the optical drive to start the computer in the BIOS
2. Insert the Windows XP CD into the CD drive to start the computer
3. Let the CD run automatically until it stops. Three choices will appear. Press [R] to select Repair Computer and you will be asked which system to enter. Please select the Windows XP code and enter the Administrator password (same as the Administrator password you entered during installation) ) If there is no password, just press the enter key
4. Type Fixboot under C: \ Windows> and press [Y] to confirm
5. Type the CD under C: \ Windows>
6. Type C ATTRIB -H NTLDR under C: \>
7. Type C ATTRIB -S NTLDR under C: \>
8. Type ATTRIB -R NTLDR under C: \>
9. Type ATTRIB -H NTDETECT.COM under C: \>
10. Type ATTRIB -S NTDETECT.COM under C: \>
11. Type ATTRIB -R NTDETECT.COM under C: \>
12. Type COPY X: \ I386 \ NTLDR C: \ under C: \> Note: X: is the code name of the CD-ROM drive.
13. Type COPY X: \ I386 \ NTDETECT.COM C: \ under C: \>
14. When finished, remove the Win XP CD and type [Exit] to restart the computer
15. Start the computer by selecting the hard drive in the BIOS
16. Use the Chinese version of Windows XP. If the menu appears garbled during startup, you can copy the bootfont.bin from the I386 directory of the Windows XP CD to the root directory of the C drive after entering Windows XP. If you use the English version of Windows XP, Bootfont.bin can be deleted from the root directory of the C drive
Solution:
· This problem may occur if the MFT root folder is fragmented. If the MFT root folder contains multiple files, the MFT becomes so fragmented that it needs to create an additional distribution index. Because the files are mapped to the distribution index alphabetically, NTLDR files may be pushed to the second distribution index. If this phenomenon occurs, you will see the error message described by NTLDR is missing Press CTRL + ALT + DEL to restart.
Generally, files are not written to the root folder. This can happen if a program regularly creates and deletes temporary files in the root folder, or by copying many files to the root folder by mistake.
This problem occurs after you copy multiple files to the root folder of the boot volume using the NTFS file system. This problem has been resolved in Windows 2000 SP4. Therefore, please check your SP status. As for the solution:
Use Recovery Console
1. Use the Windows 2000 installation disk to restart the computer, or use the Windows 2000 CD to restart the computer.
2. On the "Welcome to Setup" screen, press R to repair the Windows 2000 installation.
3. Press C to repair the Windows 2000 installation by using the "Recovery Console".
4. Type the number corresponding to the Windows installation to be repaired and press Enter. For example, type 1 and press Enter. For additional information, click the article number below to view the corresponding article in the Microsoft Knowledge Base: Type the administrator password, and then press Enter.
5. Type map, and then press ENTER. Note the drive letter assigned to the CD-ROM drive that contains the Windows 2000 CD.
6. Type the following commands, press ENTER after each command, where drive is your
The drive letter typed in step 4 of "Method 2: Use the Recovery Console":
copy drive: i386ntldr c:
copy drive: i386ntdetect.com c:
If you are prompted to overwrite the existing file, type y and press Enter.
Note: In these commands, there is a space between ntldr and c: and between ntdetect.com and c :.
7. Type the following command, and then press ENTER:
type c: Boot.ini
A list similar to the following appears:
[boot loader]
TImeout = 30
default = mulTI (0) disk (0) rdisk (0) parTITIon (1) WINNT
[operating systems]
multi (0) disk (0) rdisk (0) partition (1) WINNT = "Microsoft Windows 2000 Professional" / fastdetect
If you receive the following message, the Boot.ini file may be missing or damaged:
The system cannot find the file or directory specified.
8. If the Boot.ini file is missing or damaged, please create a new one. To do this, follow these steps:
1. Use a text editor such as Notepad or Edit.com to create a boot loader file similar to the following:
[boot loader]
timeout = 30
default = multi (0) disk (0) rdisk (0) partition (1) WINNT
[operating systems]
multi (0) disk (0) rdisk (0) partition (1) WINNT = "Microsoft Windows 2000 Professional" / fastdetect For additional information, click the article number below to view the corresponding article in the Microsoft Knowledge Base: 102873 BOOT .INI and ARC Path Naming Conventions and Usage
301680 HOW TO: Create a Boot Disk for an NTFS or FAT Partition in Windows
2. Save the file as Boot.ini to disk.
Note: If you are using Notepad to create a file, please make sure that the .txt extension is not appended to the Boot.ini file name.
3. At the recovery console command prompt, type the following command to copy the Boot.ini file from the floppy disk to the computer:
copy a: Boot.ini c:
9. Type exit, and then press ENTER. The computer will restart
In the daily use of the computer, many people may encounter “NTLDR is Missing Press any key to restart†(NTLDR file is missing, press any key to restart) after they have booted, and cannot enter the system normally. Many people may be at a loss, especially those who encounter this problem for the first time, may not know how to solve it, or choose to reinstall the operating system. In fact, it is completely unnecessary. The following is a detailed explanation of the cause of the problem and the solution:
1. Reason:
1. Sudden power failure;
2. Install the lower version of the operating system on the basis of the higher version system;
3. Abnormal shutdown or restart (turn off the power button directly or press the Reset button);
4. The NTLDR file is damaged or deleted. These are very easy to cause the loss of NTLDR files, so that the fault prompt "NTLDR is Missing Press any key to restart" will appear when starting up.
Second, the solution:
1. Solve in the "failure recovery console". Start the computer and press "DEL" to enter the BIOS setting, start from the optical drive instead, save and exit, put the Windows XP installation CD into the optical drive, enter the recovery console, and enter "copy x:" under the command status of the recovery console \ i386tldr c: \ "command and press Enter (" x "is the drive letter where the optical drive is located), then execute the" copy x: \ i386tdetect.com c: \ "command, if prompted to overwrite the file, type" y "Confirm and press Enter. Enter the "exit" command to exit the console and restart.
2. A simpler method-copy NTLDR file under DOS. Boot with a floppy disk or CD, start the computer and enter DOS, use the "dir NTLDR / s" command to find this file from the backup file (the path is relatively long, copy it against the control), and then copy it to the root directory of the C drive "copy ... tldr c: \ ", followed by the key step-write to the hard disk (can't finish COPY), you must execute the" DEBUG NTLDR "command, then execute the" W "command to write," Q "command to exit, so as to ensure Really write to the hard disk, and finally restart.
Sometimes, the Boot.ini file will also be damaged or lost at the same time, you can copy the file to other computers with Windows XP, copy it to the C drive, and then restart.
3. What is the NTLDR file?
The NTLDR file is the boot file of WIN NT architecture operating systems such as winnt / win200 / WinXP / Win2003 / WinVista. The NTLDR file is a hidden, read-only system file, located in the root directory of the system disk, used to load the operating system.
The general system boot process is this:
1. The power supply self-test program starts to run
2. The master boot record is loaded into memory, and the program begins to execute
3. The boot sector of the active partition is loaded into memory
4. NTLDR is loaded and initialized from the boot sector
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 in NTLDR, it can read FAT or NTFS.
7. NTLDR reads the boot.ini file
8. NTLDR loads the selected operating system. If NT / XP is selected, NTLDR runs Ntdetect.com. For other operating systems, NTLDR loads and runs Bootsect.dos and passes control to it. The windows NT process ends.
9.Ntdetect.com searches the computer hardware and transmits the list to NTLDR in order to write this information into HKE Y_LOCAL_MACHINEHARDWARE.
10. Then NTLDR loads Ntoskrnl.exe, Hal.dll and system information collection.
11.Ntldr searches the system information collection, and loads the device driver configuration so that the device starts to work at startup
12. Ntldr hands over control to Ntoskrnl.exe. At this time, the startup procedure ends and the loading phase begins.
Four, suggestions
Back up important system boot files such as NTLDR and Boot.ini when the system is normal. If the menu appears garbled when using the Chinese version of Windows XP, you can copy the bootfont.bin from the I386 directory of the Windows XP CD to the root directory of the C drive after entering Windows XP. If you use the English version of Windows XP, Bootfont.bin can be deleted from the root directory of the C drive.
5. [More detailed reference]
NTLDR is generally stored in the root directory of the C drive and is a system file with hidden and read-only attributes. Its main responsibility is to parse the Boot.ini file. Let's take Windows XP as an example to introduce the role of NTLDR in the system boot process.
During the boot process, Windows XP will go through three stages: pre-boot, boot, and load kernel. This is completely different from the way that Windows 9X directly reads the boot sector to start the system. NTLDR is in the three-stage boot process Will play a vital role.
1. Pre-boot stage
In the pre-boot phase, the computer does the following tasks: runs the POST program, POST will detect the total memory of the system and the status of other hardware devices, load the first physical sector of the disk into the memory, load the hard disk master boot record and run, The master boot record finds the starting location of the active partition. Then the boot sector of the active partition is loaded and executed, and finally the NTLDR file is loaded and initialized from the boot sector.
2. Boot phase
In the boot phase, Windows XP will go through four small phases, the initial boot loader phase, the operating system selection phase, the hardware detection phase, and the configuration selection phase.
(1) During the initial boot loader phase, NTLDR will convert the computer's microprocessor from real mode to 32-bit planar memory mode. In real mode, the system will reserve 640KB of memory space for MS-DOS, and the rest The memory is regarded as extended memory. In 32-bit flat mode, the system treats all memory as available memory, and then NTLDR executes the appropriate small file system driver. At this time, NTLDR can recognize each file in NTFS or FAT format. The system partition, and the initial boot loader phase ends.
(2) When the initial boot loader phase is over, it will enter the operating system selection phase. If multiple operating systems are installed on the computer, because the correct Boot.ini file is loaded by NTLDR, a selection will appear at startup The menu of the operating system, NTLDR is to find the partition location of the system file from the boot.ini file. If the NT system is selected, then NTLDR will run the NTDETECT.COM file, otherwise NTLDR will load BOOTSECT.DOS, and then give control to BOOTSECT.DOS. If there is only one operating system in the Boot.ini file or the timeout value is 0, then the menu screen for selecting the operating system will not appear. If the Boot.ini file is illegal or does not exist, then NTLDR will try to boot from the default system volume system.
Tip: After NTLDR is started, if the Hiberfil.sys file is found in the root directory of the system and the file is valid, then NTLDR will read the information in the Hiberfil.sys file and restore the system to the state before sleep. Process the Boot.ini file.
(3) When the operating system selection phase ends, it will enter the hardware detection phase. At this time, the NTDETECT.COM file will collect the hardware information list in the computer, and then return the list to NTLDR, so that NTLDR will load the hardware information into the registry Hardware in "HKEY_LOCAL_MACHINE".
(4) After the hardware detection phase ends, it will enter the configuration selection phase. If there are multiple hardware configuration lists, the configuration file selection menu will appear. If there is only one, it will not be displayed.
3. Loading kernel stage
In the kernel loading phase, NTLDR will load the NTOKRNL.EXE kernel program, then NTLDR will load the hardware abstraction layer (HAL.dll), then the system will load the "HKEY_MACHINESystem" key value in the registry, then NTLDR will read "HKEY_MACHINESystemselect" "Key value to decide which ControlSet will be loaded. The loaded ControlSet will contain the device drivers and the services that need to be loaded. Then NTLDR loads the underlying device driver with a start key value of 0 under the registry "HKEY_LOCAL_MACHINESystemservice". When the CurrentControlSet image of the ControlSet is loaded, NTLDR will pass control to NTOSKRNL.EXE, and the boot process will end.
Tip: If you press the F8 key during startup, then we will see a variety of boot modes in the boot menu. At this time, NTLDR will use the boot parameters to load the NT kernel according to the user's choice. The user can also boot. Set the startup parameters in the ini file.
NTLDR is backward compatible, which means that the higher version of NTLDR can start the lower version of the Windows NT operating system. The current version of NTLDR is the version that comes with Windows Server 2008 SP1.
If you have installed a higher version of the operating system, then if you want to install a lower version of the operating system, the lower version of the operating system will fail to enter the original high version of the operating system after installation. The cause of the problem is that the low versions of NTLDR and NTDETECT.COM cannot recognize the NTOSKRNL.EXE of the high version of the operating system, thus causing the system to not start normally.
Solution:
Just replace the higher versions of NTLDR and NTDETECT.COM with the lower versions of NTLDR and NTDETECT.COM (these two files can be extracted from the installation CD). If the BOOTSECT.DOS file is missing or damaged, just insert a Windows 9X boot disk, and then execute the SYS C: command to restart the system. Then you need to select the repair installation of the Windows NT architecture installation disc to restore the multi-boot menu.
Tip: Starting from the Windows XP SP2 system, the version of NTLDR and NTDETECT.COM will be detected when the installation program is executed. If the existing version is found to be newer than the version on the installation program, the existing version will be used instead of the installation program On the NTLDR and NTDETECT.COM versions.
Before Windows XP SP2, the system often restarted automatically when it crashed, but now, Microsoft has added an option in NTLDR, then it is: Disable automatic restart on system failure when the system crashes, friends can Press F8 during startup to find this option from the advanced startup menu. If this option is enabled, if a fatal error occurs during Windows startup, then the blue screen message will replace the automatic restart setting. In addition, we can also Turn off the automatic restart setting in the system properties.
Specific operation method:
Click the "Advanced" tab in the "System Properties" window, then click the "Settings" button in the "Startup and Recovery" column, and then cancel the "Automatic" column in the "Startup and Recovery" window. Click the "Restart" option, click "OK", and then click "OK" in the warning window that pops up.
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