Software⏱️ 3 min read📅 2026-06-11

How to Fix: PostgreSQL Install Fail in Windows 10 (icacls error / access denied)

PostgreSQL installation fails on Windows 10 due to icacls error/access denied.

Quick Answer: Run the command prompt as administrator and try installing PostgreSQL again.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

Error: 'icacls error / access denied' when installing PostgreSQL on Windows 10 (x64). This issue affects users who try to install PostgreSQL on their Windows 10 machines and encounter an error message indicating access denial. The frustration of encountering this error can be overwhelming, especially for those who are new to database management systems.

This error is particularly frustrating because it prevents users from installing the software they need to manage their data effectively. However, with a step-by-step guide, you can troubleshoot and resolve this issue efficiently.

🛑 Root Causes of the Error

  • The primary reason for this error is due to inadequate permissions on the installation directory. When trying to install PostgreSQL, the installer attempts to access the installation directory with elevated privileges, but it lacks the necessary permissions. This results in an 'icacls error / access denied' message.
  • Another possible cause of this error is related to the presence of a Group Policy Object (GPO) that restricts access to the installation directory.

🔧 Proven Troubleshooting Steps

Running PostgreSQL as an administrator and adjusting the installation directory permissions

  1. Step 1: Step 1: Run the installer as an administrator. Right-click on the installer executable file, select 'Run as administrator', and follow the installation prompts.
  2. Step 2: Step 2: Adjust the installation directory permissions to allow read and write access for the current user. Open File Explorer, navigate to the installation directory, right-click on it, and select 'Properties'. In the Properties window, click on the 'Security' tab and then click on the 'Edit' button next to 'Group or user names'. Add the current user to the list of users with read and write permissions, and then click 'OK' to close all windows.
  3. Step 3: Step 3: After making these changes, try running the installer again as an administrator. If the error persists, proceed to Method 2.

Using the PostgreSQL installer's built-in permission adjustment feature

  1. Step 1: Step 1: Before running the installer, open a Command Prompt window with administrative privileges. Type 'icacls %install_directory% /grant:r users:
  2. Step 2: Step 2: Replace '%install_directory%' with the actual path to the installation directory. The command will grant the current user read and write access to the installation directory.
  3. Step 3: Step 3: After granting permissions, run the installer as an administrator. If the error persists, proceed to further troubleshooting steps.

💡 Conclusion

By following these step-by-step instructions, you should be able to resolve the 'icacls error / access denied' issue when installing PostgreSQL on your Windows 10 machine. Remember to always run the installer with administrative privileges and adjust installation directory permissions as needed.

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