Fixed : Sysprep Fatal Error, Unable to load MSESysprep.dll

  • The Sysprep log file (setuperr) created in the C: WindowsSystem32sysprepPanther folder displays the following error(s): “Error [0x0f0085] SYSPRP LaunchDll:Unable to load DLL c:Program FilesMicrosoft Security ClientMSESysprep.dll” A Windows user reported a similar error in the Microsoft community.
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  1. Download and install the software.
  2. It will scan your computer to find problems.
  3. The tool will then correct the issues that were discovered.

Sysprep Errors

Use any text editor (such as Notepad) to open the setupact.log file in the C:/Windows/System32/Sysprep/Panther directory.

Sysprep Failed

The following error occurs when running sysprep on a Windows 8.1 based machine: “sysprep was unable to validate your Windows installation.”. This error is caused by the fact that sysprep cannot run on upgraded Windows installations.

A fatal error occurred during the Sysprep process on a computer running Windows 7 Pro. The setuperr.log files created in the C: WindowsSystem32sysprepPanther folder display the following errors:

Error [0x0f0085] Microsoft Security Client MSESysprep.dll[gle=0x00007e]: Could not load the DLL.

Sysprep Windows 10 20h2

From the menu, select Command Prompt (Admin). Hold down Windows logo key and X together for a few seconds.

Your PC can suffer numerous errors if a .dll file is missing or corrupt. The file is a vital part of your system, so it is understandable if the file doesn’t work properly. One of those errors is Sysprep Fatal Error, Could not load MSESysprep.dll. If you are experiencing the same error, then follow these steps to resolve it. This error mostly appears in older versions of the operating system, so follow these steps to fix it.

This error occurs when running external DLLs in the SYSPRP registry. dwRet = 126. [gle = 0x00007e].

A fatal error occurs when MSESysprep.dll is unable to be loaded during the installation of the system setup tool.

When I try to sysprep a Windows 7 build for a Dell laptop, I receive a Fatal Error message immediately (either when I run the GUI or answer the answer file).

A SYSPRP WinMain error is occurring. The error code is 0x0f00a8; hr = 0x8007007e[gle=0x0000007e]”

The MSESysprep.dll file is missing in the “c: Program FilesMicrosoft Security Client” folder after getting the above error. The invalid entry in the Windows registry may still exist despite the fact that the Microsoft Security Essentials client has been removed from the computer.


What causes the Sysprep Fatal Error, Could not load MSESysprep.dll

What causes the Sysprep Fatal Error, Could not load MSESysprep.dll

A Windows user reported a similar error in the Microsoft community in an older version of Windows. This error often happens when a .dll is missing from the installation directory.

A .dll file is sometimes missing from the system files or the user is using an older version of the Windows operating system, which prevents users from accessing these services. It is hoped that this guide will help you resolve the Sysprep error Cannot load MSESysprep.dll, which is an important Sysprep error.

By doing this, you can bypass this critical error, making your cross-platform experience more useful. It appears that Microsoft Security Essentials has not been completely uninstalled which is why the error occurs.


How to fix the Sysprep Fatal Error, Failed to load MSESysprep.dll

Updated: February 2024

We highly recommend that you use this tool for your error. Furthermore, this tool detects and removes common computer errors, protects you from loss of files, malware, and hardware failures, and optimizes your device for maximum performance. This software will help you fix your PC problems and prevent others from happening again:

  • Step 1 : Install PC Repair & Optimizer Tool (Windows 10, 8, 7, XP, Vista).
  • Step 2 : Click Start Scan to find out what issues are causing PC problems.
  • Step 3 : Click on Repair All to correct all issues.


Where Is Sysprep Windows 7

Select the appropriate settings as described above by opening the system prep executable file sysprep.exe that is located in C:/Windows/System32/Sysprep/.

Microsoft Security Client/MSESysprep.dll failed to load with error code 0x0f0085.

In addition, we can encounter this fatal error if MSESysprep.dll is missing from our system. Microsoft Security Essentials should be downloaded and installed in order to resolve this issue.

How to fix the Sysprep Fatal Error, Failed to load MSESysprep.dll

Remove the invalid registry entry

  1. The “Run” window will open when you press Windows + R.
  2. The registry editor can be opened by typing Regedit and clicking OK.
  3. If anything goes wrong, you can restore the registry files by clicking File and Export in the registry editor.
  4. The following location can be found in the registry editor:
    The registry key is HKLMsoftwareMicrosoftWindowsCurrentVersionSetupSysprepCleanup.
  5. The cleanup key can be accessed by right-clicking it.
  6. Permissions can be selected.
  7. Select Administrators under Permissions.
  8. To enable full access, check the Allow full access box in the Permissions for Administrators section.
  9. Save your changes by clicking OK and applying.
  10. A second clean-up button will appear.
  11. Make sure the following value is deleted in the right pane:
  12. By right-clicking the value, you can delete it.
  13. The registry editor should be closed.

The most efficient way to get your Windows 10 up and running is by using a third-party repair tool.

The software’s automated processes will handle everything else for you, so all you need to do is run it and follow the on-screen instructions to get things started.

Use a third-party uninstaller

  1. An uninstaller from a third party should be downloaded and installed.
  2. You will need to run the uninstaller provided by the third party.
  3. Look under Applications for Microsoft Security Essentials.
  4. Click Uninstall to remove it.
  5. To remove all unnecessary MSE files, run the third-party cleanup application.
  6. Run the tool after restarting your computer.

Remove the Panther folder

  1. Navigate to the File Explorer window.
  2. You can find this location by navigating to:
  3. The Pather folder can be accessed by right-clicking it.
  4. Renaming or deleting the folder are both options.
  5. You should be able to use the system preparation tool without encountering any errors if you run it again.


RECOMMENATION: Click here for help with Windows errors.

Frequently Asked Questions

  1. Use PowerShell to uninstall the package and remove the installation.
  2. Stop the tile model service.
  3. Use the registry editor.
  4. Remove your antivirus software.
  5. Download the latest version of Windows 10 and use it for Sysprep.
  6. Run an SFC scan.
  7. Run DISM.

  1. Find the error code for specific instructions.
  2. Update the software.
  3. Update the drivers.
  4. Uninstall any recently installed programs.
  5. Restore Windows to a previous state.
  6. Disable unnecessary background programs.
  7. Delete temporary files.
  8. Free up space on your hard drive.

The Sysprep tool records Windows installation activity in different directories, depending on the configuration run.

Sysprep prepares a Windows installation (Windows client and Windows server) for imaging and capturing custom installations. Sysprep removes PC-specific information from a Windows installation and "generalizes" the installation so that it can be installed on different PCs.


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Mark Ginter is a tech blogger with a passion for all things gadgets and gizmos. A self-proclaimed "geek", Mark has been blogging about technology for over 15 years. His blog,, covers a wide range of topics including new product releases, industry news, and tips and tricks for getting the most out of your devices. If you're looking for someone who can keep you up-to-date with all the latest tech news and developments, then be sure to follow him over at Microsoft.