Software⏱️ 3 min read📅 2026-06-11

How to Fix: Windows 10 Upgrade: Stops at 23% without error, Dism not mounting boot.wim WIM Image

Windows 10 Upgrade Stopped at 23% without error, Dism not mounting boot.wim WIM Image

Quick Answer: Run the DISM tool to repair corrupted system files and then try upgrading Windows again.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The Windows 10 upgrade process has encountered an issue, stopping at approximately 23% completion. This problem affects users attempting to upgrade from Windows 8.1 Pro to Windows 10 Pro, resulting in a frustrating experience with no clear error message provided by the installer.

This issue is particularly frustrating because it prevents users from completing their upgrade and accessing the latest features of Windows 10. In this troubleshooting guide, we will explore possible causes for this problem and provide step-by-step solutions to resolve the issue.

💡 Why You Are Getting This Error

  • The primary cause of this error is related to the mounting of the WIM file (winre.wim) during the upgrade process. The installer is unable to mount this file, resulting in a failure to continue with the upgrade.
  • An alternative reason for this issue could be related to corrupted system files or registry entries that are interfering with the installation process.

🔧 Proven Troubleshooting Steps

Manually mounting and repairing the WIM file

  1. Step 1: Step 1: Open Command Prompt as an administrator. Press Windows + X, select Command Prompt (Admin), and confirm the prompt.
  2. Step 2: Step 2: Run the command 'dism /online /cleanup-image /restorehealth' to repair the system image. This may take several minutes to complete.
  3. Step 3: Step 3: After the repair process is complete, run the command 'dism /online /cleanup-image /startcomponentcleanup' to remove any unnecessary components from the Windows installation.
  4. Step 4: Step 4: Once both commands have completed successfully, restart your computer and attempt the Windows 10 upgrade again.

Using a third-party tool to repair WIM files

  1. Step 1: Step 1: Download and install a third-party tool called 'Windows Repair' (available at https://www.majorgeeks.com/reports/Repair_Windows10.html).
  2. Step 2: Step 2: Run the Windows Repair tool and select the 'WIM File Repair' option. Follow the on-screen instructions to repair any damaged WIM files.
  3. Step 3: Step 3: Once the repair process is complete, restart your computer and attempt the Windows 10 upgrade again.

🎯 Final Words

By following these steps, you should be able to resolve the issue preventing your Windows 10 upgrade from completing. If you are still experiencing problems after attempting these solutions, it may be necessary to seek further assistance from Microsoft support or a qualified IT professional.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid