Download diagER.dll to Fix Errors

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

diagER.dll file Diagnostic ER Module. 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 diagER.dll related errors on your device. You can also download diagER.dll file compatible with Windows 10, Windows 8.1, Windows 8, 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 Vista, Windows Vista

File info

General information
Filename diagER.dll
File extension DLL
Description Diagnostic ER Module
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 diagER.dll file. diagER.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 diagER.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to diagER.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 diagER.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.

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

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

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

  • Windows 10: C:\WINDOWS\system32\oobe\
  • Windows 8.1: C:\WINDOWS\system32\oobe\
  • Windows 8: 1: C:\WINDOWS\system32\oobe\
  • Windows 7: C:\WINDOWS\system32\oobe\
  • Windows Vista: C:\Windows\SysWOW64\oobe\
  • Windows Vista: C:\Windows\SysWOW64\oobe\

If the steps did not solve your diagER.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 diagER.dll
System Windows 10
File size 41888 bytes
Date 2017-03-18
File details
MD5 2ae267f623355de084ecfb5e805cdf2c
SHA1 b1f964a2433980d25d456410c48c9c467994ce45
SHA256 982ca693fccc4bebb0b620e46d95eab9ee8bd94157171f563c9b7090511531a6
CRC32 8691228b
Example file location C:\WINDOWS\system32\oobe\
Filename diagER.dll
System Windows 8.1
File size 34304 bytes
Date 2014-11-21
File details
MD5 ee15095aba7a88c9c8561f9231de68bd
SHA1 f73e394b0c744151791c27dd74b261c4d25a3c3b
SHA256 13b1fcb87fbe5c2ddb036e32bd951ce4b0fdfcb72a79bdac327f290f48ffb26a
CRC32 38d17dba
Example file location C:\WINDOWS\system32\oobe\
Filename diagER.dll
System Windows 8
File size 31744 bytes
Date 2012-07-26
File details
MD5 4761e772fd508b14deb4f112b0e7237e
SHA1 a632d79a85fd05bf737f8626a41c193776d3c43b
SHA256 9e9b84c88d675af7dcb39eabfe0de4957dc30a2c68a3bbfc08ba2a984a8c4799
CRC32 1504da92
Example file location 1: C:\WINDOWS\system32\oobe\
Filename diagER.dll
System Windows 7
File size 38912 bytes
Date 2009-07-14
File details
MD5 8023bb494d26390d6f904e78b86b8da9
SHA1 2198ba4466f4627d27e50c32ac755499b05b3045
SHA256 84e55586f071e34f021c95ed7e14f460d745d3bf0d5e3ab7cd492725c7a58407
CRC32 e2efb78b
Example file location C:\WINDOWS\system32\oobe\
Filename diagER.dll
System Windows Vista
File size 31232 bytes
Date -0001-11-30
File details
MD5 01ce35d2e19e5fd2f83cf072ed77457b
SHA1 2ad3e9bdfdac72959f086ec30bab5116f381e379
SHA256 5138c85c291a2d1eb05298655f0012e4202f15b16e9e50f077b34cad6ca27311
CRC32 4202ba61
Example file location C:\Windows\SysWOW64\oobe\
Filename diagER.dll
System Windows Vista
File size 38400 bytes
Date 2008-01-21
File details
MD5 af95c4db3a4bce82297321d18777a5cb
SHA1 da38f147a6fdbb36142fa1111d49d37941dba170
SHA256 aa1b2421a69d897a70e0e14802975feacebbdacee6577b5e117bf934cf456982
CRC32 1739d877
Example file location C:\Windows\SysWOW64\oobe\