Error 0xc0000221 When Booting Windows

The 0xc0000221 error code during Windows startup often indicates a failure caused by corrupted system files, hardware issues, or failed updates. This error usually signals that the system could not load a critical component. Let’s examine the primary causes and effective solutions to address this problem.

Common Causes of Error 0xc0000221

  • Corrupted system files: Damaged or missing system files can prevent Windows from loading properly.
  • Failed update installations: Incomplete or problematic updates may lead to conflicts that trigger this error.
  • Hardware issues: Faulty RAM or a hard drive with bad sectors can also contribute to boot failures.
  • Malware infection: Viruses or malicious software can corrupt essential files, causing boot errors.

How to Fix Error 0xc0000221

1. Use Command Prompt to Repair System Files

Start by booting into the Windows Recovery Environment (WinRE) and running a system file check. Follow these steps:

  • Boot from a Windows installation media or access the recovery options through the boot menu.
  • Open Command Prompt and enter: sfc /scannow.
  • After the scan completes, restart your computer to see if the issue is resolved.

2. Check Your Hard Drive for Errors

If you suspect the issue is related to disk corruption, run a disk check using the following command:

  • Open Command Prompt in recovery mode.
  • Type: chkdsk /f /r and press Enter.
  • Wait for the process to complete, then restart your computer.

3. Repair Windows Boot Configuration

Error 0xc0000221 can sometimes be fixed by repairing the boot sector. To do this:

  • Open Command Prompt in the recovery environment.
  • Run these commands one by one:
    • bootrec /fixmbr
    • bootrec /fixboot
    • bootrec /rebuildbcd
  • After running the commands, restart your computer.

4. Roll Back Recent Changes

If the error appeared after installing new software or hardware, try reverting the changes using System Restore:

  • Boot into the Windows Recovery Environment and choose "System Restore".
  • Select a restore point from before the issue started and follow the prompts to restore your system.