How to solve the error code 0xc0000225: Windows failed to start in Windows 8

There are several ways to solve the error code 0xc0000225: Windows failed to start in Windows 8. Here are some of the solutions:

1. Use the Windows 8 installation disc or USB drive to repair the startup process:
• Insert the installation disc or USB drive and restart your computer.
• Press any key to boot from the disc or drive when prompted.
• Select your language preferences and click Next.
• Click on Repair your computer.
• Select Troubleshoot > Advanced options > Startup Repair.
• Follow the on-screen instructions to complete the repair process.


2. Use the Command Prompt to rebuild the BCD (Boot Configuration Data):
• Insert the Windows 8 installation disc or USB drive and restart your computer.
• Press any key to boot from the disc or drive when prompted.
• Select your language preferences and click Next.
• Click on Repair your computer.
• Select Troubleshoot > Advanced options > Command Prompt.
• Type the following commands and press Enter after each one:

  bootrec /fixmbr
  bootrec /fixboot
  bootrec /rebuildbcd
  

• Restart your computer and check if the error is resolved.


3. Use the Automatic Repair feature:
• Insert the Windows 8 installation disc or USB drive and restart your computer.
• Press any key to boot from the disc or drive when prompted.
• Select your language preferences and click Next.
• Click on Repair your computer.
• Select Troubleshoot > Advanced options > Automatic Repair.
• Follow the on-screen instructions to complete the repair process.


4. Check for hardware issues:
• Disconnect all external devices from your computer.
• Restart your computer and check if the error is resolved.
• If the error persists, run a hardware diagnostic test to check for any hardware issues.

If none of the above solutions work, you may need to reinstall Windows 8 or seek professional help.