⚠️ 3 verified solutions available for Error 582 — Last updated 2026-03-22
Error 582 📋

Fix ERROR_ILLEGAL_CHARACTER — Windows Error Code 582

Error 582 (ERROR_ILLEGAL_CHARACTER) is a Windows File & Disk error that occurs when an illegal character was encountered. for a multi-byte character set this includes a lead byte without a succeeding trail byte. for the unicode character set this includes the characters 0xffff and 0xfffe.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: 582 📛 ERROR_ILLEGAL_CHARACTER 📅 Updated: 2026-03-22 ⏱️ 3 Solutions
⚡ Quick Fix

Check and Repair Disk Errors: Open Command Prompt as Administrator

👇 See all 3 solutions below
🐞 Auto-Fix Script for Error 582
⚠️ How to use: Open PowerShell as Administrator, paste the code above, and press Enter.
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📑 Table of Contents
What is Error 582? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 582?

Windows System Error Code 582, known as ERROR_ILLEGAL_CHARACTER, is a File & Disk error that occurs during file system and disk I/O operations. The error indicates that: An illegal character was encountered. For a multi-byte character set this includes a lead byte without a succeeding trail byte. For the Unicode character set this includes the characters 0xFFFF and 0xFFFE. When this error is encountered, the Windows operating system was unable to complete the requested operation within the file management subsystem. The error code 582 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_ILLEGAL_CHARACTER maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within file system and disk I/O operations is essential for effective troubleshooting.

⚠️ Common Causes

  • System resource conflict: An illegal character was encountered. For a multi-byte character set this includes a lead byte without a succeeding trail byte. For the Unicode character set this includes the characters 0xFFFF and 0xFFFE.
  • The file or directory does not exist or was moved
  • Insufficient permissions on the target
  • Disk has bad sectors or is full
📚 Comprehensive Guide

Mastering the Windows Boot Manager: BCD Repair and EFI Partition Recovery

The definitive encyclopedia on fixing 'Boot Device Not Found', 0xc00000f, and manually rebuilding the EFI and BCD partitions.

Read the full guide →

✅ Step-by-Step Solutions

1 Check and Repair Disk Errors
  1. Open Command Prompt as Administrator
  2. Run: chkdsk C: /f /r (replace C: with affected drive)
  3. Type Y to schedule scan on next restart
  4. Restart and wait for the scan to complete
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Show Advanced Solutions (2 more)
2 Verify File Permissions
  1. Right-click the file/folder → Properties → Security tab
  2. Click Edit → Add your username → Grant Full Control
  3. Click Apply → OK
3 Use Windows File Recovery
  1. If a file was accidentally deleted, check Recycle Bin first
  2. Install 'Windows File Recovery' from the Microsoft Store (free)
  3. Run: winfr C: D: /extensive (scans C:, saves to D:)
  4. Check the recovered files in the output folder

🎬 Video Tutorials

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How to fix Error 582 (Illegal Character)
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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*582*" -or $_.Message -like "*ERROR_ILLEGAL_CHARACTER*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

  • Back up important files regularly
  • Run CHKDSK periodically
  • Keep 15%+ free space on system drive
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Last updated: 2026-03-22
📖
Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-22.
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