FIX: Sysprep Fatal Error, Could not load MSESysprep.dll

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While running the System Preparation tool you may encounter several errors. One such error is Sysprep Fatal Error, Could not load MSESysprep.dll.

This error is common in an older version of Windows and occurs due to a missing .dll file in the installation directory. One Windows user reported a similar error in the Microsoft community:

Trying to run sysprep – fatal error because MSE was once installed
I have a W7 Prof 64 bit machine I am trying to Sysprep.
I had MSE installed previously and uninstalled it. And I am aware of the REARM issue and I dont believe it to be the cause.

If you are also troubled by this error, here are a couple of troubleshooting tips to help you resolve Sysprep Fatal Error, Could not load MSESysprep.dll error in Windows.

How can I fix Sysprep dll errors on my Windows PC?

1. Delete an invalid entry from the registry

1. Press Windows Key + R to open Run.
2. Type regedit and click OK to open the Registry Editor.
3. On the Registry Editor, click on File and Export. Give the file a name and save it in a safe location. This way you can restore the registry files if anything goes wrong.
4. In the Registry Editor, navigate to the following location:
   HKLMsoftwareMicrosoftWindowsCurrentVersionSetupSysprepCleanup
5. Right-click on Cleanup Key.
6. Select Permissions.
7. In the Permission window, select Administrators.
   
8. Under Permissions for Administrators, check Allow box for Full Control.
9. Click Apply and OK to save the changes.
10. Select the CleanUp key again.
11. From the right pane, delete the following value:
    2D153B43-11B4-461F-AA43-832B2C8B8872
12. Right-click on the value and select Delete.
13. Close the registry editor.

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Delete Panther folder

1. Open File Explorer.
2. Navigate to the following location:
   C:WindowsSystem32sysprep 
3. Right-click on the Pather folder.
4. You can delete the folder or simply rename it.
5. Run the System Preparation tool again and it should run successfully without errors.

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2. Use Revo Uninstaller

1. Download and install Revo Uninstaller.
2. Launch Revo Uninstaller.
3. Under Applications, check for the Microsoft Security Essentials application.
4. Select it and click Uninstall.
5. Next, run the Ccleaner app and clean any leftover junk files related to MSE.
6. Once done, restart the computer and run the System Preparation tool.

The Sysprep Fatal Error, Could not load MSESysprep.dll seems to occur due to incomplete uninstallation of Microsoft Security Essentials. By following the steps in this article you can fix the error and continue with the Sysprep process.