defragres.dll Informations - Download and Fix

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

defragres.dll file Microsoft\Drive Optimizer Resources. 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 defragres.dll related errors on your device. You can also download defragres.dll file compatible with Windows 10, Windows 8.1 devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows 10, Windows 8.1

File info

General information
Filename defragres.dll
File extension DLL
Description Microsoft\Drive Optimizer Resources
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 defragres.dll file. defragres.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 defragres.dll file. If you encounter one listed below (or similar), please consider the following suggestions.

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



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


Problems related to defragres.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 defragres.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.

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

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

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

  • Windows 10: C:\Windows\System32\
  • Windows 8.1: C:\Windows\System32\

If the steps did not solve your defragres.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 defragres.dll
System Windows 10
File size 4096 bytes
Date 2017-03-18
File details
MD5 a7af7ef9c89d55c8921bd21bfc145fff
SHA1 e3e2ff81ecdff4a33593d1044083e758f1db7278
SHA256 6c28764144526aa42706cadd219a502fb6fc12088f941386f6211eff49f3bd3c
CRC32 0cba56df
Example file location C:\Windows\System32\
Filename defragres.dll
System Windows 8.1
File size 3584 bytes
Date 2013-08-22
File details
MD5 9875be46f96687b4abb744fab419813e
SHA1 7ab56a457f67dcecd87071ae32e01794cd5efaf8
SHA256 588c5f298ef944efb9bc8537ed1a83d4c8c9d18b33f695beb47b9a41f922abf0
CRC32 6c7799f2
Example file location C:\Windows\System32\