Repair and Download Portcls.sys.mui

Last Updated: 11/27/2023
[Time Required for Reading: 3.5 minutes]

portcls.sys.mui, also known as a Port Class (Class Driver for Port/Miniport Devices) file, was created by Microsoft for the development of Microsoft® Windows® Operating System. MUI files fall under under the Win32 DLL (Driver) file type category.

portcls.sys.mui was initially released with Windows 7 on 07/22/2009 for the Windows 7 Operating System. The newest file release date for Windows 8.1 was 10/18/2013 [version 6.3.9600.16384 (winblue_rtm.130821-1623)]. portcls.sys.mui is included in Windows 8.1, Windows 8, and Windows 7.

Please see below for more detailed information, MUI file troubleshooting instructions, and free downloads of different versions of portcls.sys.mui.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	portcls.sys.mui
File Extension:	MUI file extension
Description:	Port Class (Class Driver for Port/Miniport Devices)
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 (British)
File Flags:	(none)
File Flags Mask:	0x003f
Entry Point:	0x0000

View Other portcls.sys.mui Information

File Info	Description
File Size:	4.0 kB
File Modification Date/Time:	2014:11:21 06:16:30+00:00
File Inode Change Date/Time:	2017:11:05 07:04:28+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:	11.0
Code Size:	0
Initialized Data Size:	3584
Uninitialized Data Size:	0
Entry Point:	0x0000
OS Version:	6.3
Image Version:	6.3
Subsystem Version:	6.0
Subsystem:	Windows GUI
File Version Number:	6.3.9600.16384
Product Version Number:	6.3.9600.16384
File Flags Mask:	0x003f
File Flags:	(none)
File OS:	Windows NT 32-bit
Object File Type:	Driver
File Subtype:	9
Language Code:	English (British)
Character Set:	Unicode
Company Name:	Microsoft Corporation
File Description:	Port Class (Class Driver for Port/Miniport Devices)
File Version:	6.3.9600.16384 (winblue_rtm.130821-1623)
Internal Name:	portcls.sys
Legal Copyright:	© Microsoft Corporation. All rights reserved.
Original Filename:	portcls.sys.mui
Product Name:	Microsoft® Windows® Operating System
Product Version:	6.3.9600.16384

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

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What are portcls.sys.mui Error Messages?

Dynamic Link Library portcls.sys.mui Errors

portcls.sys.mui is considered a type of Dynamic Link Library (DLL) file. Dynamic Link Library files, like portcls.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 portcls.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 portcls.sys.mui is attempted to be loaded either when Windows is starting up, or in some cases already running. Some of the most common portcls.sys.mui errors include:

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

Your portcls.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, portcls.sys.mui file corruption could be caused from a power outage when loading Windows, system crash while loading portcls.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 portcls.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 portcls.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 portcls.sys.mui error, please proceed to the Step 2 below.

Step 2: Run SFC (System File Checker) to restore the corrupt or missing portcls.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 portcls.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 portcls.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 portcls.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 portcls.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 portcls.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 portcls.sys.mui file version. We maintain a comprehensive database of 100% malware-free portcls.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 portcls.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 7: C:\Windows\System32\drivers\en-US\
Windows 8: C:\Windows\System32\drivers\en-US\
Windows 8.1: C:\Windows\System32\Drivers\en-GB\

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 8.1.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve portcls.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 portcls.sys.mui Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying portcls.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 portcls.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 8.1

File Name

Software Version

File Version

Architecture

portcls.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:	4096
File Date:	11/21/2014
MD5 Checksum:	ec37329668e786b8327297767a27b23d
SHA1 Checksum:	ea34cf5e633db5ade43493f00bfdba3b2c1a7b6e
SHA256 Checksum:	342b104576cf61016f60d83af51c26f0e2f0e9083c1c5362649adb4e651653b8
CRC32:
File Directory Location:	C:\Windows\System32\Drivers\en-GB\

File Version, System, and Machine Information
File Type:	Win32 DLL
Image Version:	6.3
Initialized Data Size:	3584
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

portcls.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:	4096
File Date:	07/26/2012
MD5 Checksum:	2d0ba0db35d5c45ed5433de22a89ed3d
SHA1 Checksum:	1b70b197810977b049f901647e99a228a6034f41
SHA256 Checksum:	cd7080695b392b0757385b66d4f9cae40592e8f321f93ed2d4f1a757917e6918
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:	3584
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

portcls.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:	fd3dc59e253f1588cfdc984a08d5ab06
SHA1 Checksum:	f15823d5cf4c041f89ac7b974fb9da50fb930e7f
SHA256 Checksum:	50947e955206e55d9ca43f7e6cb84ad7259b9a735dae8d5194289fff174dcc1d
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 portcls.sys.mui

MUI Files Related to portcls.sys.mui

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
mlang.dll.mui	Myriad User Instrument	Windows Vista	18432	C:\$WINDOWS.~BT\Sources\Boot\PXE\nl-NL\
LXAA1mini.dll.mui	WIA Mini Driver	WIA Mini Driver (1.0.0.0)	3072	C:\Windows\SysWOW64\
winethc.dll.mui	Myriad User Instrument	Windows Vista	6656	C:\Windows\Panther\UnattendGC\
SearchIndexer.exe.mui	Microsoft Windows Search Indexer	Windows® Search (7.00.7600.16385)	7168	C:\Windows\System32\Sysprep\Panther\
sdohlp.dll.mui	NPS SDO Helper Component	Microsoft® Windows® Operating System (6.2.9200.16384)	3584	C:\WINDOWS\Tasks\

Other Files Related to portcls.sys.mui

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
OneX_v1.xsd	XML Schema Definition	Windows 8.1	5957	C:\Windows\L2Schemas\
OneX_v1.xsd	XML Schema Definition	Windows Vista	5957	C:\Windows\L2Schemas\
OneX_v1.xsd	XML Schema Definition	Windows 10	5957	C:\Windows\L2Schemas\
WWAN_profile_v1.xsd	XML Schema Definition	Windows 7	6201	C:\Windows\L2Schemas\
WWAN_profile_v1.xsd	XML Schema Definition	Windows 8.1	6201	C:\Windows\L2Schemas\

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