Downloading and Repairing Modem.sys.mui

Last Updated: 11/27/2023
[Time to Read Article: 5 minutes]

modem.sys.mui uses the MUI file extension, which is more specifically known as a Modem Device Driver file. It is classified as a Win32 DLL (Driver) file, created for Microsoft® Windows® Operating System by Microsoft.

modem.sys.mui was first released for Windows Vista Operating System on 11/08/2006 with Windows Vista. The most recent version [file version 10.0.15063.0 (WinBuild.160101.0800)] was introduced on 07/29/2015 for Windows 10. modem.sys.mui is found in Windows 10, Windows Vista, and Windows 8.1.

Please continue reading to find your correct modem.sys.mui file version download (free), detailed file information, and MUI file troubleshooting instructions.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	modem.sys.mui
File Extension:	MUI file extension
Description:	Modem Device Driver
Object File Type:	Driver
File Operating System:	Windows NT 32-bit
MIME Type:	application/octet-stream
User Popularity Rating:

Developer and Software Information
Software Developer:	Microsoft Corporation
Software Program:	Microsoft® Windows® Operating System
Legal Copyright:	© Microsoft Corporation. All rights reserved.

File Details
Character Set:	Unicode
Language Code:	English (U.S.)
File Flags:	(none)
File Flags Mask:	0x003f
Entry Point:	0x0000

View Other modem.sys.mui Information

File Info	Description
File Size:	4.0 kB
File Modification Date/Time:	2017:03:18 05:00:38+00:00
File Inode Change Date/Time:	2017:11:05 07:07:54+00:00
File Type:	Win32 DLL
MIME Type:	application/octet-stream
Machine Type:	Intel 386 or later, and compatibles
Time Stamp:	0000:00:00 00:00:00
PE Type:	PE32
Linker Version:	14.10
Code Size:	0
Initialized Data Size:	3584
Uninitialized Data Size:	0
Entry Point:	0x0000
OS Version:	10.0
Image Version:	10.0
Subsystem Version:	6.0
Subsystem:	Windows GUI
File Version Number:	10.0.15063.0
Product Version Number:	10.0.15063.0
File Flags Mask:	0x003f
File Flags:	(none)
File OS:	Windows NT 32-bit
Object File Type:	Driver
File Subtype:	7
Language Code:	English (U.S.)
Character Set:	Unicode
Company Name:	Microsoft Corporation
File Description:	Modem Device Driver
File Version:	10.0.15063.0 (WinBuild.160101.0800)
Internal Name:	modem.sys
Legal Copyright:	© Microsoft Corporation. All rights reserved.
Original Filename:	modem.sys.mui
Product Name:	Microsoft® Windows® Operating System
Product Version:	10.0.15063.0

^✻ Portions of file data provided by Exiftool (Phil Harvey) distributed under the Perl Artistic License.

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What are modem.sys.mui Error Messages?

Dynamic Link Library modem.sys.mui Errors

modem.sys.mui is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like modem.sys.mui, are essentially a "guide book" that stores information and instructions for executable (EXE) files - like sapisvr.exe - to follow. These files were created so that multiple programs (eg. Windows) could share the same modem.sys.mui file, saving valuable memory allocation, therefore making your computer run more efficiently.

Unfortunately, what makes DLL files so convenient and efficient, also makes them extremely vulnerable to problems. If something happens to a shared MUI file, either it goes missing or gets corrupted in some way, it can generate a "runtime" error message. Runtime is pretty self-explanatory; it means that these errors are triggered when modem.sys.mui is attempted to be loaded either when Windows is starting up, or in some cases already running. Some of the most common modem.sys.mui errors include:

Access Violation at address - modem.sys.mui.
modem.sys.mui could not be found.
Cannot find C:\Windows\System32\drivers\en-US\modem.sys.mui.
Cannot register modem.sys.mui.
Cannot start Windows. A required component is missing: modem.sys.mui. Please install Windows again.
Failed to load modem.sys.mui.
The application has failed to start because modem.sys.mui was not found.
The file modem.sys.mui is missing or corrupt.
This application failed to start because modem.sys.mui was not found. Re-installing the application may fix this problem.

Your modem.sys.mui file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Windows), or deleted by a malware infection. Furthermore, modem.sys.mui file corruption could be caused from a power outage when loading Windows, system crash while loading modem.sys.mui, bad sectors on your storage media (usually your primary hard drive), or quite commonly, a malware infection. Thus, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

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How to Fix modem.sys.mui Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your modem.sys.mui issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
When you see the search box, type "System Restore" and press "ENTER".
In the search results, find and click System Restore.
Please enter the administrator password (if applicable / prompted).
Follow the steps in the System Restore Wizard to choose a relevant restore point.
Restore your computer to that backup image.

If the Step 1 fails to resolve the modem.sys.mui error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing modem.sys.mui file.

System File Checker is a utility included with every Windows version that allows you scan and restore corrupted system files. Use the SFC tool to fix missing or corrupt modem.sys.mui files (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
In the search box, type "cmd" but DO NOT PRESS "ENTER".
Press and hold "CTRL-Shift" on your keyboard while pressing "ENTER".
You'll be prompted with a permission dialog box.
In the box, click "YES".
You should have a black screen with a blinking cursor.
In that black screen, type "sfc /scannow" and hit "ENTER".
SFC will begin scanning for modem.sys.mui issues and any other system file problems.
Follow any on-screen commands to complete the process.

Please be aware that this scan might take a while, so please be patient while it is working.

If this Step 2 fails as well, please proceed to the Step 3 below.

sfc /scannow

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many modem.sys.mui error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

Hit the Windows Start button
In the search box, type "Update" and press "ENTER".
In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
If updates are available for download, click "Install Updates".
After the update is completed, restart your PC.

If Windows Update failed to resolve the modem.sys.mui error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

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If Those Steps Fail: Download and Replace Your modem.sys.mui File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate modem.sys.mui file version. We maintain a comprehensive database of 100% malware-free modem.sys.mui files for every applicable version of Windows. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download modem.sys.mui Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy the file into the appropriate directory for your Windows version:

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

Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve modem.sys.mui problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

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Download modem.sys.mui Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying modem.sys.mui to your appropriate Windows system directory. Microsoft typically does not release Windows MUI files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing modem.sys.mui and all other MUI files for Windows. An incorrectly installed MUI file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Windows 10

File Name

Software Version

File Version

Architecture

modem.sys.mui

10.0.15063.0

10.0.15063.0 (WinBuild.160101.0800)

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	Microsoft® Windows® Operating System
Software Version:	10.0.15063.0
File Version:	10.0.15063.0 (WinBuild.160101.0800)
File Size:	4096
File Date:	03/18/2017
MD5 Checksum:	f3b40ae2c6b059352347778d92ce047f
SHA1 Checksum:	48887723d8182c0a4cd908050f0d37c97c0156d7
SHA256 Checksum:	da12f461da7665f2e8c869a426df9d48c5b6db7e92b30705f3e4908d8f57157e
CRC32:
File Directory Location:	C:\Windows\System32\drivers\en-US\

File Version, System, and Machine Information
File Type:	Win32 DLL
Image Version:	10.0
Initialized Data Size:	3584
Linker Version:	14.10
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Windows GUI
Subsystem Version:	6.0
File Modification Date/Time:	03/18/2017

Windows Vista

File Name

Software Version

File Version

Architecture

modem.sys.mui

6.0.6000.16386

6.0.6000.16386 (vista_rtm.061101-2205)

32-bit (x32)

Expand for Detailed File Information +

OS Version:	Windows Vista
Software:	Microsoft® Windows® Operating System
Software Version:	6.0.6000.16386
File Version:	6.0.6000.16386 (vista_rtm.061101-2205)
File Size:	3584
File Date:	11/02/2006
MD5 Checksum:	825c6ca914e306dea2d9414a23ab7c35
SHA1 Checksum:	fa460f699381f334e9f72c1cc46570b40a15a91d
SHA256 Checksum:	f59d6d95ccdaaee554597721e6589a597c081ca4d60896875d27b5af4e11292b
CRC32:
File Directory Location:	C:\Windows\System32\drivers\en-US\

File Version, System, and Machine Information
File Type:	Win64 DLL
Image Version:	6.0
Initialized Data Size:	3072
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Windows GUI
Subsystem Version:	5.2
File Modification Date/Time:	11/02/2006

Windows 8.1

File Name

Software Version

File Version

Architecture

modem.sys.mui

6.3.9600.16384

6.3.9600.16384 (winblue_rtm.130821-1623)

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 8.1
Software:	Microsoft® Windows® Operating System
Software Version:	6.3.9600.16384
File Version:	6.3.9600.16384 (winblue_rtm.130821-1623)
File Size:	3584
File Date:	11/21/2014
MD5 Checksum:	14c735491d0b03cd54d429dd35bed47a
SHA1 Checksum:	f487da03e15011cfb744063be2d623b3e28b1163
SHA256 Checksum:	1b3479111e941584b56882bb2295bbc3bef68c48b1b6767313eb65cb97d553cf
CRC32:
File Directory Location:	C:\Windows\System32\drivers\en-US\

File Version, System, and Machine Information
File Type:	Win32 DLL
Image Version:	6.3
Initialized Data Size:	3072
Linker Version:	11.0
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Windows GUI
Subsystem Version:	6.0
File Modification Date/Time:	11/21/2014

Windows 8

File Name

Software Version

File Version

Architecture

modem.sys.mui

6.2.9200.16384

6.2.9200.16384 (win8_rtm.120725-1247)

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 8
Software:	Microsoft® Windows® Operating System
Software Version:	6.2.9200.16384
File Version:	6.2.9200.16384 (win8_rtm.120725-1247)
File Size:	3584
File Date:	07/26/2012
MD5 Checksum:	b1bdc09eac02563474eb5f2c16f8ef6d
SHA1 Checksum:	36717c4978ee0385c2c17a02e7ad350d53a13860
SHA256 Checksum:	18d05af173d695898efdf54a5e54612d5f1259754815d253a526463a68114a04
CRC32:
File Directory Location:	C:\Windows\System32\drivers\en-US\

File Version, System, and Machine Information
File Type:	Win32 DLL
Image Version:	6.2
Initialized Data Size:	3072
Linker Version:	10.10
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Windows GUI
Subsystem Version:	5.1
File Modification Date/Time:	07/26/2012

Windows 7

File Name

Software Version

File Version

Architecture

modem.sys.mui

6.1.7600.16385

6.1.7600.16385 (win7_rtm.090713-1255)

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 7
Software:	Microsoft® Windows® Operating System
Software Version:	6.1.7600.16385
File Version:	6.1.7600.16385 (win7_rtm.090713-1255)
File Size:	3584
File Date:	04/12/2011
MD5 Checksum:	b9d5d5c08d86e45933607821949f64a3
SHA1 Checksum:	ed8b7e7871116b98f79aba869a4fd24cd9e5c9e4
SHA256 Checksum:	4b92d49722c5af6ab7756acb52475c9cb0e3d194f5de9596df1ddb602f56594e
CRC32:
File Directory Location:	C:\Windows\System32\drivers\en-US\

File Version, System, and Machine Information
File Type:	Win64 DLL
Image Version:	6.1
Initialized Data Size:	3072
Linker Version:	9.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Windows GUI
Subsystem Version:	5.2
File Modification Date/Time:	04/12/2011

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Files Related to modem.sys.mui

MUI Files Related to modem.sys.mui

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
wininet.dll.mui	Internet Extensions for Win32	Windows® Internet Explorer (7.00.6000.16386)	43520	C:\WINDOWS\Tasks\
WLanConn.dll.mui	Dot11 Connection Flows	Microsoft® Windows® Operating System (6.1.7600.16385)	8192	C:\Windows\Logs\DPX\
wsecedit.dll.mui	Security Configuration UI Module	Microsoft® Windows® Operating System (6.1.7600.16385)	406528	C:\Windows\Panther\UnattendGC\
msimsg.dll.mui	Myriad User Instrument	Windows Vista	98304	C:\$WINDOWS.~BT\Sources\Boot\PXE\qps-plocm\
wwanadvui.dll.mui	Wireless WAN Connection Flows	Microsoft® Windows® Operating System (08.01.9200.16384)	46592	C:\Windows\Panther\NewOs\Panther\

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p2057.ngr	NEPLAN Graphic Data	Windows Vista	3188068	C:\Windows\Speech\Engines\SR\en-GB\
l2057.mllr	CMU Sphinx MLLR Data	Windows 7	249	C:\Windows\Speech\Engines\SR\en-GB\

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