Download and Fix DDACLSys.dll

Sometimes Windows system displays error messages regarding corrupted or missing DDACLSys.dll files. Situations like that can occur, for example, during a software installation process. Each software program requires certain resources, libraries, and source data to work properly. Corrupted or nonexistent DDACLSys.dll file can therefore effect in failed execution of the started process.

DDACLSys.dll file SysPrep module for Resetting Data Drive ACL. The file was developed by for use with software. Here you will find detailed information about the file and instructions how to proceed in the event of DDACLSys.dll related errors on your device. You can also download DDACLSys.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, Windows Vista devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows 7, Windows Vista, Windows Vista

File info

General information
Filename DDACLSys.dll
File extension DLL
Description SysPrep module for Resetting Data Drive ACL
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
MIME type application/octet-stream
File type Executable application
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)

There are various types of errors related to DDACLSys.dll file. DDACLSys.dll file may be located in wrong file directory on your device, may not be present in the system, or may be infected with malicious software and therefore not work correctly. Below is a list of most common error messages related to DDACLSys.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

  • DDACLSys.dll is corrupted
  • DDACLSys.dll cannot be located
  • Runtime Error - DDACLSys.dll
  • DDACLSys.dll file error
  • DDACLSys.dll file cannot be loaded. Module was not found
  • cannot register DDACLSys.dll file:
  • DDACLSys.dll file could not be loaded
  • DDACLSys.dll file doesn't exist



Application could not be started because DDACLSys.dll file is missing. Reinstall the application to solve the problem.


Problems related to DDACLSys.dll can be addressed in various ways. Some methods are meant only for advanced users. If you don't have confidence in your skills, we suggest consulting a specialist. Fixing DDACLSys.dll file errors should be approached with utmost caution for any mistakes can result in unstable or unproperly working system. If you have the necassary skills, please proceed.

DDACLSys.dll file errors can be caused by various factors, so its is beneficial to try to fix them using various methods.

Step 1: Scan your computer for any malicious software

Virus Scan

Windows files are commonly attacked by malicious software that prevents them from working properly. First step in addressing problems with DDACLSys.dll file or any other Windows system files should be scanning the system for malicious software using an antivirus tool.

If by any chance you don't have any antivirus software installed on your system yet, you should do it immediately. Unprotected system is not only a source of file errors, but, more importantly, makes your system vulnerable to many dangers. If you don't know which antivirus tool to choose, consult this Wikipedia article – comparison of antivirus software.

Step 2: Update your system and drivers.

Windows Update

Installing relevant Microsoft Windows patches and updates may solve your problems related to DDACLSys.dll file. Use dedicated Windows tool to perform the update.

  1. Go to the Windows "Start" menu
  2. Type "Windows Update" in the search field
  3. Choose the appropriate software program (name may vary depending on your system version)
  4. Check if your system is up to date. If any unapplied updates are listed, install them immediately.
  5. After the update has been done,restart your computer in order to complete the process.

Beside updating the system, it is recommended that you install latest device drivers, as drivers can influence proper working of DDACLSys.dll or other system files. In order to do so, go to your computer or device producer's website where you will find information regarding latest driver updates.

Step 3: Use System File Checker (SFC) tool

System File Checker

System File Checker is a Microsoft Windows tool. As the name suggests, the tool is used for identyfing and addressing system file related errors, including those related to DDACLSys.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the DDACLSys.dll file with properly working version. To use the tool:

  1. Go to the Windows "Start" menu
  2. Type "cmd" in the search field
  3. Locate "Command Prompt" result – don't run it yet:
  4. Click the right mouse button and select "Run as Administrator" option
  5. Type "sfc /scannow" in console prompt to start the program and follow the instructions

Step 4: Restoring Windows system

Windows Recovery

Another approach is to restore system to previous state, before the DDACLSys.dll file error occured. In order to restore your system, follow the instructions below

  1. Go to the Windows "Start" menu
  2. Type "System Restore" in the search field
  3. Start the system restore tool – it's name may differ depending on version of the system
  4. The application will guide you through the process – read the messages carefully
  5. After the process has finished, restart your computer.

If all the above-mentioned methods failed and the DDACLSys.dll file problem has not been resolved, proceed to the next step. Remember that the following steps are intended only for advanced users.

Download and replace DDACLSys.dll file

The last solution is to manually download and replace DDACLSys.dll file in appropriate folder on the disk. Select file version compatible with your operating system and click the "Download" button. Next, go to your web browser's "Downloaded" folder and copy the downloaded DDACLSys.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of DDACLSys.dll file example directory paths.

  • Windows 10: C:\Windows\System32\
  • Windows 8.1: C:\Windows\System32\
  • Windows 8: 1: C:\Windows\System32\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows 7: C:\Windows\SysWOW64\
  • Windows Vista: ---
  • Windows Vista: ---

If the steps did not solve your DDACLSys.dll file problem, you should consult a professional. A probability exists that the error(s) might be device-related and therefore should be resolved at the hardware level. A fresh operating system installation might be necessary – a faulty system installation process can result in data loss.

File versions list

Filename DDACLSys.dll
System Windows 10
File size 25504 bytes
Date 2017-03-18
File details
MD5 02da158d896311e4af2eef733c1b2428
SHA1 11d780f98027176af9e08da5fb1198f55f0aba72
SHA256 a44d18536dfa4efff3f78f9f047cd9fedb7c9875db66cd2f040f9937c63a9123
CRC32 3939b36d
Example file location C:\Windows\System32\
Filename DDACLSys.dll
System Windows 8.1
File size 15872 bytes
Date 2014-11-21
File details
MD5 4ab05263b7ef78aa24ca98ef7e935199
SHA1 89634fdc0e30c05d981354fe7ee04211397490c5
SHA256 80c3e4fa9239a7bc8aeb71469c7a797ce834d0124365dd02d3d965de2bbbf89c
CRC32 da5c7a1a
Example file location C:\Windows\System32\
Filename DDACLSys.dll
System Windows 8
File size 15360 bytes
Date 2012-07-26
File details
MD5 bc237bb24e7605f0fd8be5930a46c53d
SHA1 94149d1893ea6cae282741e66470fa1bb20efe4f
SHA256 23cdccf095176f603bd74b8cba9d9bba60d3c9357239f3007f058c81cc62a62f
CRC32 c7fb6581
Example file location 1: C:\Windows\System32\
Filename DDACLSys.dll
System Windows 7
File size 15360 bytes
Date -0001-11-30
File details
MD5 31183b5dff81053c8d10f7d15ea418f8
SHA1 a2ec16be5687162a9cdf15dff7666b90626ff932
SHA256 7acfb659a550eb08a5d62173c1bffcca8b40c63646f9b67e3a829bf674a4c861
CRC32 73ba0e80
Example file location C:\Windows\SysWOW64\
Filename DDACLSys.dll
System Windows 7
File size 17408 bytes
Date 2009-07-14
File details
MD5 a717414d6f1f452fb233e3143be97e51
SHA1 21a3cf2c1e18a02dc7dc1853e0c815405ed7f63f
SHA256 b2ea4311019ac8f093e2a35f347b122fec93e360a18df0411f9ae995f8713ec5
CRC32 5491e664
Example file location C:\Windows\SysWOW64\
Filename DDACLSys.dll
System Windows Vista
File size 15360 bytes
Date -0001-11-30
File details
MD5 4168502dd2cd264db32f62458e227ce4
SHA1 262ea4758e02611204a5df3c2a95a123c66b04f5
SHA256 d3cf19d653d47e62a366e4a687f15a066073dd45739dbde969645654f46c6c0f
CRC32 23dd133f
Example file location ---
Filename DDACLSys.dll
System Windows Vista
File size 17408 bytes
Date 2006-11-02
File details
MD5 8b0cd8bdfa4bbf5e301d658c294687ae
SHA1 2fd67ac66f6c530d1876c2af1d3f26e6f1c54e94
SHA256 58363d57764e3045f41ed0e8cb3acf87ed55241dc24ae9962f0756c678b452cf
CRC32 a8e3dc03
Example file location ---