How to Repair DiagCpl.dll? Download Now

Sometimes Windows system displays error messages regarding corrupted or missing DiagCpl.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 DiagCpl.dll file can therefore effect in failed execution of the started process.

DiagCpl.dll file Troubleshooting Control Panel. 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 DiagCpl.dll related errors on your device. You can also download DiagCpl.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7 devices which will (most probably) allow you to solve the problem.

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

File info

General information
Filename DiagCpl.dll
File extension DLL
Description Troubleshooting Control Panel
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
MIME type application/octet-stream
File type Dynamic link library
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 DiagCpl.dll file. DiagCpl.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 DiagCpl.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to DiagCpl.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 DiagCpl.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.

DiagCpl.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 DiagCpl.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 DiagCpl.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 DiagCpl.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 DiagCpl.dll file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the DiagCpl.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 DiagCpl.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 DiagCpl.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 DiagCpl.dll file

The last solution is to manually download and replace DiagCpl.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 DiagCpl.dll file.

Go to the folder where the file should be located and paste the downloaded file. Below is the list of DiagCpl.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\System32\

If the steps did not solve your DiagCpl.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 DiagCpl.dll
System Windows 10
File size 1011712 bytes
Date 2017-03-18
File details
MD5 97ce7a3dd94870dbcc2d5c02f4769f41
SHA1 c52407a6f5be50a010e25ae189556f9ee1d07692
SHA256 664f5c4bbc466444238b1dca431fbfebce518cf170ada1ac4d2253759e95425a
CRC32 9dc3f729
Example file location C:\Windows\System32\
Filename DiagCpl.dll
System Windows 8.1
File size 1005568 bytes
Date 2014-11-21
File details
MD5 e23543235f3692d2fe46a382f931fec9
SHA1 b355c653b7eec8df28c55dc90ef6de3683db7710
SHA256 2447d15cd59e90fcc4091ab21f334fbf3b5a348dfe1e7e8397ec50de56144d0a
CRC32 32a15539
Example file location C:\Windows\System32\
Filename DiagCpl.dll
System Windows 8
File size 991232 bytes
Date 2012-07-26
File details
MD5 6e4e0ea5d1b0c49813e74812697090f3
SHA1 d9df22d1db68e12d74a971f062377c536d99e2df
SHA256 31b5c1ccc42e3c1047245eea8fde3a93fd055d27ab19a47fa03939aaec63ff0f
CRC32 f1f9b72b
Example file location 1: C:\Windows\System32\
Filename DiagCpl.dll
System Windows 7
File size 1202176 bytes
Date 2010-11-21
File details
MD5 dc50b0fe1c3f654ac25b5484bf3a458c
SHA1 d1c22c43d67d25ad607aafaf97c485adcce35166
SHA256 1df1c724755b7e82254c0159df6d82b77ac7f18439265fb938710b9bfdaaa586
CRC32 25b8f5a1
Example file location C:\Windows\System32\