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Troubleshoot acpi.sys.mui Errors and Download File

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

acpi.sys.mui file ACPI Driver for NT. 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 acpi.sys.mui related errors on your device. You can also download acpi.sys.mui 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 acpi.sys.mui
File extension MUI
Description ACPI Driver for NT
Software
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
Details
MIME type application/octet-stream
File type Driver
System Windows NT 32-bit
Copyrights © Microsoft Corporation. All rights reserved.
Character set Unicode
Language cod English (U.S.)
acpi.sys.mui

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

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

acpi.sys.mui

Error

Application could not be started because acpi.sys.mui file is missing. Reinstall the application to solve the problem.

OK

Problems related to acpi.sys.mui 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 acpi.sys.mui 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.

acpi.sys.mui 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 acpi.sys.mui 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 acpi.sys.mui 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 acpi.sys.mui 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 acpi.sys.mui file. After an error related to%fileextension% file has been discovered, the program attempts to automatically replace the acpi.sys.mui 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 acpi.sys.mui 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 acpi.sys.mui 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 acpi.sys.mui file

The last solution is to manually download and replace acpi.sys.mui 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 acpi.sys.mui file.

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

  • Windows 10: C:\Windows\System32\drivers\en-US\
  • Windows 8.1: C:\Windows\System32\drivers\en-US\
  • Windows 8: 1: C:\Windows\System32\drivers\en-US\
  • Windows 7: C:\Windows\System32\drivers\en-US\
  • Windows Vista: C:\Windows\System32\drivers\en-US\

If the steps did not solve your acpi.sys.mui 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 acpi.sys.mui
System Windows 10
File size 10752 bytes
Date 2017-03-18
File details
MD5 1f2c195dcd7f6d44042b2a7b729cd40e
SHA1 5c84a9c05476489f49dfd7bd3b1d9c565a7c0e93
SHA256 657f56f55f0f3569faa63a7f8a9393018e7166efa1081d2263b1b3aa660446a1
CRC32 fd09ae23
Example file location C:\Windows\System32\drivers\en-US\
Filename acpi.sys.mui
System Windows 8.1
File size 10240 bytes
Date 2014-11-21
File details
MD5 b5da56efd818f1c893e2107ec968ce05
SHA1 8ea19bf1daa9fa85de5da504b18092e648d627ae
SHA256 e85360baaeff31c1a564c59b2bcaa6be1189fc411c413dedea1466c6cd3bfe74
CRC32 99f87e6b
Example file location C:\Windows\System32\drivers\en-US\
Filename acpi.sys.mui
System Windows 8
File size 10240 bytes
Date 2012-07-26
File details
MD5 34bbfcda51fb9fac51b7cb753a7d9c94
SHA1 4fe417e9e5a623970ede3bc54e16e425dfed1f35
SHA256 f38e35c6f7beb81c5b423c552ce688073c18b09d6693f649d37330791957273a
CRC32 bc86be6e
Example file location 1: C:\Windows\System32\drivers\en-US\
Filename acpi.sys.mui
System Windows 7
File size 9216 bytes
Date 2011-04-12
File details
MD5 32022c811a44b86ff45d20acab6d9bf6
SHA1 152c9ee255204c3fa64c1f3bbaad1b4b95b9fb86
SHA256 fdea57ec9055cc99f1719ec91cf26effd59e1a4883e3f7405265d2bbb6dec30d
CRC32 d15a6e50
Example file location C:\Windows\System32\drivers\en-US\
Filename acpi.sys.mui
System Windows Vista
File size 9216 bytes
Date 2006-11-02
File details
MD5 267b452d74b9d979f00ec46af8687c49
SHA1 43a095f7cfdb0e2302c49c5150bc82afbbce3482
SHA256 7a9d7f1be17555df30dfe0de3974ab2fc2abdb1507840a122ef4b8b2cca1da45
CRC32 527d69a7
Example file location C:\Windows\System32\drivers\en-US\