Npf.sys: How to Fix, Download, and Update

Last Updated: 11/26/2023
[Time to Read: ~3-5 minutes]

npf.sys uses the SYS file extension, which is more specifically known as a npf.sys (NT5/6 AMD64) Kernel Driver file. It is classified as a Win64 EXE (Driver) file, created for WinPcap by Xi Software.

The first version of npf.sys for Easy WiFi Radar 1.05 was seen on 10/01/2007 in Windows 10. The latest version update [v4.1.0.2980] for Net Transport was 2.96L released on 07/21/2017.

Continue reading below to discover detailed file information, SYS file troubleshooting, and free downloads of several versions of npf.sys.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	npf.sys
File Extension:	SYS file extension
Description:	npf.sys (NT5/6 AMD64) Kernel 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:	Riverbed Technology, Inc.
Software Program:	WinPcap
Legal Copyright:	Copyright © 2010-2013 Riverbed Technology, Inc. Copyright © 2005-2010 CACE Technologies. Copyright © 1999-2005 NetGroup, Politecnico di Torino.

File Details
Character Set:	Unicode
Language Code:	Neutral
File Flags:	(none)
File Flags Mask:	0x003f
Entry Point:	0x9008
Code Size:	22016

View Other npf.sys Information

File Info	Description
File Size:	36 kB
File Modification Date/Time:	2020:02:21 09:40:19+00:00
File Type:	Win64 EXE
MIME Type:	application/octet-stream
Machine Type:	AMD AMD64
Time Stamp:	2013:03:01 01:31:24+00:00
PE Type:	PE32+
Linker Version:	8.0
Code Size:	22016
Initialized Data Size:	6144
Uninitialized Data Size:	0
Entry Point:	0x9008
OS Version:	6.0
Image Version:	6.0
Subsystem Version:	6.0
Subsystem:	Native
File Version Number:	4.1.0.2980
Product Version Number:	4.1.0.2980
File Flags Mask:	0x003f
File Flags:	(none)
File OS:	Windows NT 32-bit
Object File Type:	Driver
File Subtype:	7
Language Code:	Neutral
Character Set:	Unicode
Company Name:	Riverbed Technology, Inc.
File Description:	npf.sys (NT5/6 AMD64) Kernel Driver
File Version:	4.1.0.2980
Internal Name:	NPF + TME
Legal Copyright:	Copyright © 2010-2013 Riverbed Technology, Inc. Copyright © 2005-2010 CACE Technologies. Copyright © 1999-2005 NetGroup, Politecnico di Torino.
Product Name:	WinPcap
Product Version:	4.1.0.2980
Legal Trademarks:

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

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What are npf.sys Error Messages?

npf.sys Blue Screen of Death (BSOD) Errors

There are a number of reasons why you could be encountering issues with npf.sys. Most of the issues concerning sys files involve Blue Screen of Death (BSOD) errors. These types of npf.sys errors can be cause by hardware problems, outdated firmware, corrupt drivers, or other software-related (eg. Net Transport update) issues. Some of these errors include:

npf.sys could not be found.
npf.sys failed to load.
The file npf.sys is missing or corrupt.
Windows failed to start - npf.sys.

A problem has been detected and Windows has been shut down to prevent damage to your computer. The problem seems to be caused by the following file: npf.sys.

:( Your PC ran into a problem that it couldn't handle, and now needs to restart. You can search for the error online: [BSOD] (npf.sys).

STOP 0x0000003B: SYSTEM SERVICE EXCEPTION (npf.sys) STOP 0x0000007E: SYSTEM THREAD EXCEPTION NOT HANDLED (npf.sys) STOP 0×0000007A: KERNEL DATA INPAGE (npf.sys) STOP 0x00000050: PAGE FAULT IN A NONPAGED AREA (npf.sys) STOP 0x0000001E: KMODE EXCEPTION NOT HANDLED (npf.sys) STOP 0x0000000A: IRQL NOT LESS EQUAL (npf.sys)

It's Critical to Resolve Blue Screen of Death Errors

In the majority of cases, you will encounter npf.sys BSOD errors after you've installed new hardware, software (Net Transport), or performed a failed Windows Update. In other cases, software corruption caused by a malware infection can lead to npf.sys Blue Screen of Death errors. Therefore, it's critical to make sure your anti-virus is kept up-to-date and scanning regularly.

GEEK TIP : As a rule of thumb, it's always a good idea to create a Windows "Snapshot" backup / System Restore Point before making any hardware or software changes to your computer. That way, it's very easy to restore your system in the unfortunate event you encounter a npf.sys Blue Screen of Death error after recent changes.

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How to Fix npf.sys 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 npf.sys 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 npf.sys error, please proceed to the Step 2 below.

Step 2: If recently installed Net Transport (or related software), uninstall then try reinstalling Net Transport software.

You can uninstall Net Transport software by following these instructions (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
In the search box, type "Uninstall" and press "ENTER".
In the search results, find and click "Add or Remove Programs"
Find the entry for Net Transport 2.96L and click "Uninstall"
Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Net Transport software.

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

Net Transport 2.96L

Xi Software

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 npf.sys 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 npf.sys 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 npf.sys 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 npf.sys file version. We maintain a comprehensive database of 100% malware-free npf.sys files for every applicable version of Net Transport. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download npf.sys Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy this file to the appropriate Net Transport folder location:

Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Windows\System32\drivers\
Windows 10: C:\Windows\SysWOW64\drivers\
Show 1 more directory +
Windows 10: C:\Windows\System32\drivers\
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 npf.sys 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 npf.sys Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying npf.sys to your appropriate Windows system directory. Xi Software typically does not release Net Transport SYS 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 npf.sys and all other SYS files for Net Transport. An incorrectly installed SYS file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

NETGEAR Genie 2.4.58

File Name

Software Version

File Version

Architecture

npf.sys

4.1.0.2001

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap
Software Version:	4.1.0.2001
File Version:	4.1.0.2001
File Size:	35344
File Date:	01/23/2020
MD5 Checksum:	351533acc2a069b94e80bbfc177e8fdf
SHA1 Checksum:	67c9c64f7642456c86e49a1f600712139a9de1f2
SHA256 Checksum:	54b2749e0496ecc94ce65657627762b485cbc825767baeddad0d2598820ffb9e
CRC32:
File Directory Location:	C:\Windows\System32\drivers\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.0
Initialized Data Size:	6144
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.0
File Modification Date/Time:	01/23/2020

Net Transport 2.96L

File Name

Software Version

File Version

Architecture

npf.sys

4.1.0.2980

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap
Software Version:	4.1.0.2980
File Version:	4.1.0.2980
File Size:	36600
File Date:	02/21/2020
MD5 Checksum:	de7fcc77f4a503af4ca6a47d49b3713d
SHA1 Checksum:	8206e2d8374f5e7bf626e47d56d2431edc939652
SHA256 Checksum:	4bfaa99393f635cd05d91a64de73edb5639412c129e049f0fe34f88517a10fc6
CRC32:
File Directory Location:	C:\Windows\System32\drivers\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.0
Initialized Data Size:	6144
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.0
File Modification Date/Time:	02/21/2020

BlackWidow 6.3

File Name

Software Version

File Version

Architecture

npf.sys

4.1.0.2001

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap
Software Version:	4.1.0.2001
File Version:	4.1.0.2001
File Size:	35344
File Date:	01/23/2020
MD5 Checksum:	351533acc2a069b94e80bbfc177e8fdf
SHA1 Checksum:	67c9c64f7642456c86e49a1f600712139a9de1f2
SHA256 Checksum:	54b2749e0496ecc94ce65657627762b485cbc825767baeddad0d2598820ffb9e
CRC32:
File Directory Location:	C:\Windows\System32\drivers\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.0
Initialized Data Size:	6144
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.0
File Modification Date/Time:	01/23/2020

Streaming Video Recorder 6.2.4

File Name

Software Version

File Version

Architecture

npf.sys

4.1.0.2980

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap
Software Version:	4.1.0.2980
File Version:	4.1.0.2980
File Size:	36600
File Date:	02/21/2020
MD5 Checksum:	de7fcc77f4a503af4ca6a47d49b3713d
SHA1 Checksum:	8206e2d8374f5e7bf626e47d56d2431edc939652
SHA256 Checksum:	4bfaa99393f635cd05d91a64de73edb5639412c129e049f0fe34f88517a10fc6
CRC32:
File Directory Location:	C:\Windows\System32\drivers\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.0
Initialized Data Size:	6144
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.0
File Modification Date/Time:	02/21/2020

Easy WiFi Radar 1.05

File Name

Software Version

File Version

Architecture

npf.sys

3.1.0.27

3, 1, 0, 27

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap Netgroup Packet Filter Driver
Software Version:	3.1.0.27
File Version:	3, 1, 0, 27
File Size:	32512
File Date:	12/21/2019
MD5 Checksum:	d21fee8db254ba762656878168ac1db6
SHA1 Checksum:	a394b1bc33a3c678e4b6b3c55373468e6afa7b28
SHA256 Checksum:	3694aa2145af617c47a7b506bd3d22824659ca3bf1680d220892cac4bd0fc846
CRC32:
File Directory Location:	C:\Windows\SysWOW64\drivers\

File Version, System, and Machine Information
File Type:	Win32 EXE
Image Version:	5.0
Initialized Data Size:	3840
Linker Version:	7.10
Machine Type:	Intel 386 or later, and compatibles
PE Type:	PE32
Subsystem:	Native
Subsystem Version:	5.0
File Modification Date/Time:	12/21/2019

VSO Downloader 5.0.1.61

File Name

Software Version

File Version

Architecture

npf.sys

4.1.0.2980

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
Software:	WinPcap
Software Version:	4.1.0.2980
File Version:	4.1.0.2980
File Size:	36600
File Date:	02/21/2020
MD5 Checksum:	de7fcc77f4a503af4ca6a47d49b3713d
SHA1 Checksum:	8206e2d8374f5e7bf626e47d56d2431edc939652
SHA256 Checksum:	4bfaa99393f635cd05d91a64de73edb5639412c129e049f0fe34f88517a10fc6
CRC32:
File Directory Location:	C:\Windows\System32\drivers\

File Version, System, and Machine Information
File Type:	Win64 EXE
Image Version:	6.0
Initialized Data Size:	6144
Linker Version:	8.0
Machine Type:	AMD AMD64
PE Type:	PE32+
Subsystem:	Native
Subsystem Version:	6.0
File Modification Date/Time:	02/21/2020

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Files Related to npf.sys

SYS Files Related to npf.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
npf.sys	npf.sys (NT5/6 AMD64) Kernel Driver	WinPcap (4.1.0.2980)	36600	C:\Windows\System32\winevt\Logs\

Other Files Related to npf.sys

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
setupact.log	Log	Net Transport 2.96L	62521	C:\Windows\Panther\UnattendGC\
api-ms-win-core-profil...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	10600	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-synch-...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	13160	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
api-ms-win-core-memory...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	11624	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
EtwRTEventLog-Applicat...	Microsoft Event Trace Log	Net Transport 2.96L	1592	C:\Windows\System32\LogFiles\WMI\RtBackup\

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