AdoNetDiag.dll Troubleshoot and Download

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

AdoNetDiag.dll file Dynamic Link Library. The file was developed by Microsoft for use with Windows software. Here you will find detailed information about the file and instructions how to proceed in the event of AdoNetDiag.dll related errors on your device. You can also download AdoNetDiag.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 AdoNetDiag.dll
File extension DLL
Type Dynamic Link Library
Description Dynamic Link Library
Program Windows 10
Software Windows
Author Microsoft
Software version 10
File size 173744
Oldest file 2009-04-11
Latest file 2017-03-18

There are various types of errors related to AdoNetDiag.dll file. AdoNetDiag.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 AdoNetDiag.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to AdoNetDiag.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 AdoNetDiag.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.

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

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

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

  • Windows 10: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 8.1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 8: 1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
  • Windows 7: C:\Windows\Microsoft.NET\Framework\v2.0.50727\
  • Windows 7: C:\Windows\Microsoft.NET\Framework\v2.0.50727\
  • Windows Vista: ---
  • Windows Vista: ---

If the steps did not solve your AdoNetDiag.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 AdoNetDiag.dll
System Windows 10
File size 173744 bytes
Date -0001-11-30
File details
MD5 20cb23d119c769112dbf3767ac1ceaa2
SHA1 bc30ccd49b9cc782245516a57384696696dcdb94
SHA256 464aef110105e6e275f110832fa73583f46bc753927b2a21fdf263c1337d2702
CRC32 0a20d81b
Example file location C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename AdoNetDiag.dll
System Windows 8.1
File size 170584 bytes
Date -0001-11-30
File details
MD5 f7ef83df9ffca04d5beb2f168a2bb86e
SHA1 c07444eb6b5bea2d93e016a34de241442b31a76a
SHA256 6df2435613570539a2720a89373e5ceaeb612c2a5dec0cde6246a82431e5561b
CRC32 8e865c69
Example file location C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename AdoNetDiag.dll
System Windows 8
File size 162232 bytes
Date -0001-11-30
File details
MD5 bd527bfcd60ed86b01f5c9d5ae41aa15
SHA1 27fbef26a94790bb59c1378672c8f4e700602679
SHA256 b8b1e6f1eb5ca70dd8614cec7c7dece6c979638fcd3635c6d718c4182fae09ed
CRC32 52268f74
Example file location 1: C:\Windows\Microsoft.NET\Framework\v4.0.30319\
Filename AdoNetDiag.dll
System Windows 7
File size 144712 bytes
Date 2009-06-10
File details
MD5 db106268d9c8d85a185cb41c41e57742
SHA1 b7738eccdd021b10d087ea607358fa4f7bfe6353
SHA256 df0f75351b0609bcdb8bb07ae7b7d5814fdc5c433666702fa6c5afa77b19f0dc
CRC32 a57cb1c4
Example file location C:\Windows\Microsoft.NET\Framework\v2.0.50727\
Filename AdoNetDiag.dll
System Windows 7
File size 195912 bytes
Date -0001-11-30
File details
MD5 f76a7f684916e0317ff1a913dec66d84
SHA1 4d42a5f58c6688a9851aedce76dc08022efebb24
SHA256 e2785c151e73dd74f7f5550c6fe718cf640c144aec47b7431926251796d60ce5
CRC32 ac121ab8
Example file location C:\Windows\Microsoft.NET\Framework\v2.0.50727\
Filename AdoNetDiag.dll
System Windows Vista
File size 195920 bytes
Date -0001-11-30
File details
MD5 00a2d6111f7b4e5770e7e2299d779d6f
SHA1 e0f614544977d6565131eb7aabea05944f7d047e
SHA256 9a86bd7c435de87354a037bdf27535171902d94af696c3b136f1fad8318e7ae9
CRC32 c3fac077
Example file location ---
Filename AdoNetDiag.dll
System Windows Vista
File size 144712 bytes
Date -0001-11-30
File details
MD5 14e142b887f1c067c0e8f7f0c25c2fc9
SHA1 5d12f89a7f14152448638686a60e590f29103637
SHA256 945e796b699c66ed0cdaa3dfbaca12f42c34fc653526d827443fb66d788466cd
CRC32 0d42aabe
Example file location ---