The error code "0xc000000f" is usually caused by a system boot configuration data (BCD) problem, which prevents the computer from finding the correct startup information. 1. Use Windows to install the USB disk to enter the recovery environment, and execute bootrec /fixmb, bootrec /fixboot and bootrec /rebuildbcd through the command prompt to repair the boot record and rebuild the BCD; 2. Check whether the hard disk connection is loose, try to replug or replace the SATA interface to eliminate poor hardware contact; 3. If the BCD file is seriously damaged, manually delete the old file and use the bootrec /rebuildbcd command to rebuild; 4. Enter the BIOS check boot mode (UEFI/Legacy) and the hard disk recognition status, and restore the default settings if necessary. In most cases, the first two steps can be solved. If it still cannot be repaired, it may require reinstalling the system or replacing the hard disk.

This error usually occurs when Windows starts, prompting code similar to "0xc000000f", which is actually a problem related to the system boot configuration data (BCD). Simply put, the computer cannot find the correct startup information, which leads to the inability to enter the system.

Below are some common and practical solutions, which can be done in order.

1. Use the installation USB drive to repair the boot

If you have Windows installation USB drive or restore the environment, this is the most direct way. This process will not affect your personal files, mainly repairing boot records and BCD.

Operation steps:

• Insert the USB flash drive, restart and enter the PE or installation interface.

  

• Go to Repair Computer > Troubleshooting > Advanced Options > Command Prompt.

• Enter the following command and execute it one by one:

   bootrec /fixmbr
  bootrec /fixboot
  bootrec /rebuildbcd

These commands repair the main boot record, boot sector, and rebuild boot configuration data. After completion, exit and restart to see if there is any improvement.

2. Check the hard drive connection or replace the interface

Sometimes this problem is not a system problem, but a hardware problem. In particular, aging of mechanical hard disks, loose interfaces, or poor SATA line contact may cause the system to not be able to read key files.

You can try:

• After shutting down, unplug the hard drive cable and plug it again.
• If it is a desktop computer, you can try changing the SATA interface.
• If it is a laptop, you can try to disassemble the machine and clean the hard disk connection.

This step is easy for many people to ignore, but it is very common in reality, especially old computers.

3. Manually rebuild BCD files

If you can already enter the command prompt (such as by installing a USB flash drive), but the above command is useless, it may be that the BCD file is seriously damaged and needs to be deleted manually and rebuilt.

The operation process is as follows:

1. First enter c: Enter and enter the system disk.
2. Enter the following command to view the current BCD file location:

    cd boot
   dir

3. If you see a BCD file, back up first (optional):

    ren BCD BCD.bak

4. Then run:

    bootrec /rebuildbcd

   At this time, the system will regenerate the BCD file.

If successful, restart will restore normality.

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4. BIOS settings may also affect startup

Some motherboards will have this problem after updating the BIOS or changing the boot mode, such as changing from UEFI to Legacy mode, or changing from AHCI to RAID in hard disk mode.

Suggest you:

• Enter BIOS (press Del/F2/F12 and other keys when powering on)
• Check whether the startup mode matches the system installation method (usually UEFI is now)
• Confirm that the hard disk is recognized normally, "None" or "Not Found" is not displayed
• If you are not sure about the settings, you can try to restore the default settings (Load Optimized Defaults)

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Basically these are the methods. In most cases, the first two can solve the problem. If it doesn't work, you may want to consider reinstalling the system or replacing the hard drive.

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