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1. Boot into Safe Mode

• Restart your computer and press F8 or the appropriate key for your system during startup.
• Select Safe Mode from the Advanced Boot Options menu.

2. Run System File Checker (SFC)

• Open Command Prompt as Administrator.
• Type the following command and press Enter:
  bash

  sfc /scannow

• This will scan for and attempt to repair corrupted system files.

3. Run DISM Tool

• bash

  • DISM /Online /Cleanup-Image /RestoreHealth
  • This tool repairs Windows image files and resolves deeper corruption issues3.

  4. Check Disk for Errors

  • Use the following command in Command Prompt:
    bash

    chkdsk C: /f /r
  • Replace
    text

    C:
    with your system drive letter if different.
  • This will scan for bad sectors on your hard drive and repair them37.

  5. Restore Missing or Corrupted

  acpiex.sys

  • Ensure the acpiex.sys  file exists in the folder:
    
    C:\Windows\System32\Drivers
  • If missing, you can restore it using Windows installation media:
    • Boot from the installation media.
    • Select Repair your computer > Troubleshoot > Command Prompt.
    • Copy the file from the installation media to the specified folder8.

  6. Address Registry Issues

  • Backup your registry before making changes:
    • Open Command Prompt and type
      regedit
      .
    • In Registry Editor, go to File > Export to save a backup.
  • Use a trusted registry cleaner tool to fix potential issues safely4.

  7. Perform Startup Repair

  • Boot into Windows Recovery Environment using installation media.
  • Select Repair your computer > Troubleshoot > Startup Repair.
  • Follow on-screen instructions to attempt automatic repair.

  8. Check Hardware Components

  • Inspect your hard drive and RAM for hardware failures:
    • Test RAM modules individually if you suspect memory issues.
    • Use diagnostic tools like MemTest86 or built-in hardware diagnostics provided by your PC manufacturer.

  9. Reinstall Windows (Last Resort)

  If all else fails, reinstalling Windows may be necessary:

  • Back up important files using a bootable USB or recovery tool.
  • Use installation media to perform a clean installation.

  By following these steps, you should be able to resolve error code

  text

  0xc0000221

  while minimizing data loss.

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  FIX 0xc0000221 Error Code RECOVERY Your PC/Device Needs to ...

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