NPF.sys – How to Fix & Should I Remove It?

Written by Daniel Zimmerman

I understand the importance of keeping your computer system secure and free from potential threats. In this blog post, we will explore the file “npf.sys” and its role in the Windows operating system. Additionally, we will discuss whether you should remove it, and if you encounter any errors related to this file, how to fix them.

In rare cases, npf.sys can be associated with malware or malicious activity. While npf.sys itself is a legitimate system file used by the Npcap packet capturing driver, malicious actors may attempt to exploit it for nefarious purposes. Hackers may disguise malware as npf.sys to evade detection and gain unauthorized access to network traffic.

To avoid falling victim to npf.sys-related malware, it is crucial to ensure that you are using a legitimate and up-to-date version of Npcap from a trusted source. Additionally, maintaining robust cybersecurity practices, such as using reputable antivirus and anti-malware software, regularly updating your operating system and applications, and exercising caution when downloading files from the internet, can help protect your system from potential threats, including npf.sys-related malware.

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What is npf.sys?

The npf.sys is a system file that belongs to the Npcap packet capturing driver. Npcap is a legitimate and open-source packet capturing library used by various network utilities and applications. It allows software to capture and analyze network traffic, making it essential for network monitoring, troubleshooting, and security analysis.

File NameDescription
npf.sysnpf.sys is a system file that belongs to the Npcap packet capturing driver.
C:\Windows\System32\drivers\Variable (depending on the version)
npf.sys is part of Npcap, a packet capturing driver used for network traffic analysis and monitoring.Nmap Project
Is it safe?Digital Signature
Yes, npf.sys is safe and essential for the proper functioning of Npcap, a legitimate network packet capture utility used by security professionals and network administrators.Yes, npf.sys is digitally signed by “Insecure.Com LLC,” which confirms its authenticity and integrity.

The npf.sys file is specifically associated with the Npcap driver, which enables applications to access low-level network data, including packet capturing and filtering. This driver is commonly used by network monitoring tools, intrusion detection systems (IDS), and network sniffers.

Should I Remove npf.sys?

In general, npf.sys is not a file that you should remove from your system. It is a legitimate and essential component for specific network-related functionalities, especially if you use network monitoring or security tools that rely on packet capturing capabilities.

However, like any system file, npf.sys can be targeted by malicious software attempting to impersonate legitimate components for malicious purposes. To ensure that npf.sys is not being used maliciously on your system, it’s crucial to keep your computer protected with up-to-date antivirus and anti-malware software.

How to Fix npf.sys Errors?

If you encounter errors related to npf.sys, they are likely caused by issues with the Npcap driver or conflicts with other software on your system. Here are some steps you can take to troubleshoot and resolve npf.sys errors:

  1. Update Npcap: Ensure that you are using the latest version of Npcap. Check the official Npcap website or the website of the application that uses Npcap for any available updates.
  2. Reinstall Npcap: If you suspect that the Npcap driver is corrupted or not installed correctly, consider uninstalling and then reinstalling Npcap to resolve any potential issues.
  3. Check for Conflicts: Some other software or drivers on your system might be conflicting with Npcap. Try disabling or uninstalling any recently installed software that may be causing the problem.
  4. Perform System File Check: Use the built-in “sfc /scannow” command in the Command Prompt to scan for and repair any corrupted system files, including npf.sys.
  5. Seek Professional Help: If you are unsure about troubleshooting the npf.sys errors or suspect malware activity, consider seeking assistance from cybersecurity experts or technical support.

How to Remove Malware?

GridinSoft Anti-Malware is a powerful and reliable tool designed to detect and remove various types of malware from your computer. It can effectively eliminate viruses, adware, spyware, trojans, rootkits, and other malicious threats that may compromise your system’s security and privacy.

Start by downloading GridinSoft Anti-Malware from the button above. Once the download is complete, run the installer and follow the on-screen instructions to install the software on your computer.

Step 1: Perform a Full System Scan

Go to the “Scan” tab and choose the type of scan you want to perform. For comprehensive malware removal, select the “Full Scan” option. Click the “Full Scan” area to initiate the scanning process.

The Main Screen in Gridinsoft Anti-Malware

The Main Screen in Gridinsoft Anti-Malware

GridinSoft Anti-Malware will thoroughly examine your entire system, including files, memory, registry, and other areas where malware might be hiding.

Step 2: Remove Detected Malware

After the scan is complete, GridinSoft Anti-Malware will display the scan results. It will list all detected threats and their severity levels. Review the list and checkmark the items you want to remove.

Was Found Malware on infected PC. Probably related with NPF.sys

Was Found Malware on infected PC

Click the “Remove” button to start the malware removal process. GridinSoft Anti-Malware will quarantine and remove the selected threats from your system. Follow any additional prompts or instructions as needed.

Step 3: Restart & Enable Real-Time Protection

After the removal process is complete, restart your computer to finalize the changes and ensure that the malware is completely eliminated.

PC Protection in process

PC Protection in process

For ongoing protection against future threats, enable the real-time protection feature of GridinSoft Anti-Malware. This will monitor your system in real-time and prevent malware from infiltrating your computer in the first place.


Remember, it is essential to exercise caution when dealing with system files and drivers. Always back up your data before making any significant changes to your system, and ensure you are using legitimate and up-to-date software from trusted sources.

By taking these precautions and staying vigilant, you can help maintain a secure and reliable computing environment, free from potential threats related to npf.sys or any other system files.

What is NPF.sys file? How to fix your system?

Name: NPF.sys

Description: The npf.sys is a system file that belongs to the Npcap packet capturing driver. It is part of Npcap, a legitimate network packet capture utility used by security professionals and network administrators for network traffic analysis and monitoring. The npf.sys driver allows Npcap to capture and analyze network packets, making it a valuable tool for diagnosing network issues, conducting security assessments, and performing various network-related tasks. Npcap is a packet capture and analysis library for Windows systems, providing functionality similar to the widely used libpcap on Unix-based operating systems. The npf.sys driver works at the kernel level, enabling Npcap to capture packets directly from the network interface, which is essential for accurate and efficient packet analysis.

Operating System: Windows

Application Category: File

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About the author

Daniel Zimmerman

I'm Daniel, a seasoned professional deeply passionate about the realm of security and malware defense. With over a decade of experience in the security industry and a background in writing, I am thrilled to share my expertise through this cybersecurity blog.

Throughout my career, I've had the privilege of working on the front lines of cybersecurity, tirelessly combating emerging threats and safeguarding digital environments. This hands-on experience has allowed me to develop a deep understanding of the ever-evolving landscape of malware and cyber-attacks.

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