Fix CompatUI.dll Errors

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

CompatUI.dll file CompatUI Module. 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 CompatUI.dll related errors on your device. You can also download CompatUI.dll file compatible with Windows Vista, Windows Vista, Windows XP devices which will (most probably) allow you to solve the problem.

For Windows Compatible with: Windows Vista, Windows Vista, Windows XP

File info

General information
Filename CompatUI.dll
File extension DLL
Description CompatUI Module
Program CompatUI Module
Software Windows
Author Microsoft
Software version XP
MIME type application/octet-stream
File type Dynamic link library
System Win32
Copyrights Copyright 2001

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

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



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


Problems related to CompatUI.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 CompatUI.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.

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

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

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

  • Windows Vista: C:\Windows\System32\
  • Windows Vista: C:\Windows\System32\
  • Windows XP: C:\WINDOWS\system32\dllcache\

If the steps did not solve your CompatUI.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 CompatUI.dll
System Windows Vista
File size 341504 bytes
Date 2008-01-21
File details
MD5 0fe7a5199755cc357a554e7071fdb631
SHA1 f58c1227826f78c28c25bb234f84791a6b629522
SHA256 889f06af1a798c1e24499220b08d62119ed98b688c441ce3e5426636c96ef8e0
CRC32 c213d874
Example file location C:\Windows\System32\
Filename CompatUI.dll
System Windows Vista
File size 282624 bytes
Date -0001-11-30
File details
MD5 18bc013fd5a9f5ba2068119c83d550d9
SHA1 b832579f7399eb1dada666a9c3b079e6fe49bde4
SHA256 f56ac0aafc7ac16d50447987ec177f37a08bbff00d3c04c6a348f4a911dc356f
CRC32 7df3d3c2
Example file location C:\Windows\System32\
Filename CompatUI.dll
System Windows XP
File size 252928 bytes
Date 2008-04-14
File details
MD5 809cfe39672e833e806e00560ddd7568
SHA1 e9575e2032ef5932c365c77fbb424f699b624b45
SHA256 5cef41cb0dc8268628ac828e2d84b0cda10a75497dfb5ce8f9d9aa0dfac9ef01
CRC32 b12b10fc
Example file location C:\WINDOWS\system32\dllcache\