⚠️ 3 verified solutions available for Error 587 — Last updated 2026-03-13
Error 587 📋

Fix ERROR_MUTANT_LIMIT_EXCEEDED — Windows Error Code 587

Error 587 (ERROR_MUTANT_LIMIT_EXCEEDED) is a Windows File & Disk error that occurs when an attempt was made to acquire a mutant such that its maximum count would have been exceeded.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: 587 📛 ERROR_MUTANT_LIMIT_EXCEEDED 📅 Updated: 2026-03-13 ⏱️ 3 Solutions
⚡ Quick Fix

Check and Repair Disk Errors: Open Command Prompt as Administrator

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🐞 Auto-Fix Script for Error 587
⚠️ How to use: Open PowerShell as Administrator, paste the code above, and press Enter.
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📑 Table of Contents
What is Error 587? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 587?

Windows System Error Code 587, known as ERROR_MUTANT_LIMIT_EXCEEDED, is a File & Disk error that occurs during file system and disk I/O operations. The error indicates that: An attempt was made to acquire a mutant such that its maximum count would have been exceeded. When this error is encountered, the Windows operating system was unable to complete the requested operation within the file management subsystem. The error code 587 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_MUTANT_LIMIT_EXCEEDED 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 attempt was made to acquire a mutant such that its maximum count would have been exceeded.
  • The file or directory does not exist or was moved
  • Insufficient permissions on the target
  • Disk has bad sectors or is full
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The ultimate encyclopedia on resolving Windows network stack failures, TCP/IP corruption, Winsock errors, and DNS cache poisoning.

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✅ 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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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 587 (Mutant Limit Exceeded)
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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 "*587*" -or $_.Message -like "*ERROR_MUTANT_LIMIT_EXCEEDED*"} | 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: 2026-03-13
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Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.
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