Download and Fix diagperf.dll

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

diagperf.dll file Microsoft Performance Diagnostics. 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 diagperf.dll related errors on your device. You can also download diagperf.dll file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, 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

File info

General information
Filename diagperf.dll
File extension DLL
Description Microsoft Performance Diagnostics
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 diagperf.dll file. diagperf.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 diagperf.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to diagperf.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 diagperf.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.

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

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

Go to the folder where the file should be located and paste the downloaded file. Below is the list of diagperf.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\
  • Windows Vista: C:\Windows\System32\

If the steps did not solve your diagperf.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 diagperf.dll
System Windows 10
File size 968192 bytes
Date 2017-03-18
File details
MD5 e67d4cd4d5fde16a4e03ddcada4cc4c9
SHA1 004a01c458c4cc578c55278241388e37e274a83b
SHA256 fc3f87e81f130bde15d5942c0cb019021b868e89aae464c186eb8ce87633312f
CRC32 b9625987
Example file location C:\Windows\System32\
Filename diagperf.dll
System Windows 8.1
File size 1105408 bytes
Date 2014-11-21
File details
MD5 62ac1d4453f3fd17c22ef1dee0f361d4
SHA1 312e304eb293ccb5417410575978743ffdf0db10
SHA256 5d45b02abae48663034487188dec4e29dcd0e3fb3745cf4aa4e71027f5632b11
CRC32 76cfdb7e
Example file location C:\Windows\System32\
Filename diagperf.dll
System Windows 8
File size 1072128 bytes
Date 2012-07-26
File details
MD5 11bd442bf443115e463dee2938896fb3
SHA1 dfbfc8dc8a2060616ecce188b62d7dbc6575919d
SHA256 30de29ccc2ec21d622bc3d71dd6236034eb15a7df46cd5933992d91f23e6dbfb
CRC32 3fb81279
Example file location 1: C:\Windows\System32\
Filename diagperf.dll
System Windows 7
File size 1340416 bytes
Date 2010-11-21
File details
MD5 4449d23e8f197862f1b16f1e6c89c36c
SHA1 002dcb0cc8735557f08066feecc1888a7b8e65e6
SHA256 93af52bf8e870c0381f027d3bb8f6829e449242074472f1593eb8172d7eb6559
CRC32 79e53c3a
Example file location C:\Windows\System32\
Filename diagperf.dll
System Windows Vista
File size 1584128 bytes
Date 2009-04-11
File details
MD5 7371d6b52b85190971cb3f35fa0ced05
SHA1 c4a3ddfddf10688fdbab6c430507c05641d050c6
SHA256 85c39664d66234da1774d763f4e7d70cae0578d7b7e87c1a6c82c7faf4e06491
CRC32 4b337374
Example file location C:\Windows\System32\