acpi.sys - How to Fix? Download Now

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

acpi.sys 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 related errors on your device. You can also download acpi.sys file compatible with Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista, Windows Vista, Windows Vista, Windows XP 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, Windows Vista, Windows XP

File info

General information
Filename acpi.sys
File extension SYS
Description ACPI Driver for NT
Program Microsoft® Windows® Operating System
Author Microsoft Corporation
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.)

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

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



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


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

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

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

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

If the steps did not solve your acpi.sys 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
System Windows 10
File size 572312 bytes
Date 2017-03-18
File details
MD5 462ac31cfb3fd6daac417833eb82b695
SHA1 9a40e2ae31ce9c15b32b41159bf76df999ca168c
SHA256 aab25a06cab614a7ac54d3cc94156e2263a390ce476279aea2ca1034f4b639cd
CRC32 22286dff
Example file location C:\Windows\System32\drivers\
Filename acpi.sys
System Windows 8.1
File size 426304 bytes
Date 2014-11-21
File details
MD5 eb7850e3a46f6ff48aecd77a016dab0b
SHA1 ad0a743f28d667bfc375dd7e5f9b88c926c2c220
SHA256 4d9086f1fa2969550dea74257d6a86d77d4ed581c65494c99abe956cf9da36ca
CRC32 a9bd5ca5
Example file location C:\Windows\System32\drivers\
Filename acpi.sys
System Windows 8
File size 337648 bytes
Date 2012-07-26
File details
MD5 682595b152aa55b2237d40eb9a3271fc
SHA1 9f6dd4f0c2e0a3f89487db1e5606b991244930b1
SHA256 350b91f98e79a666e667a69d3d041951b7a07743653b0b571ae96179fc45dbcf
CRC32 3546df34
Example file location 1: C:\Windows\System32\drivers\
Filename acpi.sys
System Windows 7
File size 334208 bytes
Date 2010-11-21
File details
MD5 d81d9e70b8a6dd14d42d7b4efa65d5f2
SHA1 54fb26c69829d3f1d0774d4e608327ffefa34d76
SHA256 fdaab7e23012b4d31537c5bdef245bb0a12fa060a072c250e21c68e18b22e002
CRC32 fd27adad
Example file location ---
Filename acpi.sys
System Windows Vista
File size 325608 bytes
Date -0001-11-30
File details
MD5 1965aaffab07e3fb03c77f81beba3547
SHA1 7a3b331a3ca1582222a03b63e99f56eac827128e
SHA256 351a1ebb1b95c8e03ed125c8f997dee810b4df36ad290e7685fc01963b522bfc
CRC32 b8917cce
Example file location ---
Filename acpi.sys
System Windows Vista
File size 326712 bytes
Date 2008-01-21
File details
MD5 8c99ed256a889d647935a97c543b7b85
SHA1 755bc0db51f5d0e0667919bd43387d48346d8444
SHA256 a11099d52528a398cc01c84eb2ad83120171b7b2e24c1aedda18596c921183e4
CRC32 a4e60d32
Example file location ---
Filename acpi.sys
System Windows Vista
File size 313960 bytes
Date -0001-11-30
File details
MD5 b10c33bf685ac7d2a80daf585f993821
SHA1 c5f0cf5c63bf9b45358ba4e409bffef05b1d15e9
SHA256 ea63accbd8b55c9b12948ea11e002b98bb25823550fbe004bb571d4eb23c7a55
CRC32 43fd23a9
Example file location ---
Filename acpi.sys
System Windows XP
File size 187776 bytes
Date 2008-04-14
File details
MD5 8fd99680a539792a30e97944fdaecf17
SHA1 faf1ae66cc016dd7281a1fca53be841b6b611106
SHA256 594f8e0c3695400b0c09a797af6bdfac6f750ecd67d0ee803914c572b1dcc43c
CRC32 b5814113
Example file location ---