What is naiavf5x?

Naiavf5x.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if naiavf5x.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for naiavf5x drivers in need of updating

Naiavf5x.sys file information

The process known as Anti-Virus File System Filter Driver belongs to software NaiAvFilter1 or VirusScan (Enterprise, ASaP & Retail.) by McAfee ( or Network Associates (

Description: Naiavf5x.sys is not essential for Windows and will often cause problems. Naiavf5x.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 114,464 bytes (33% of all occurrences), 117,024 bytes, 116,992 bytes or 108,256 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. It is not a Windows system file. naiavf5x.sys appears to be a compressed file. Therefore the technical security rating is 28% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you have any problems with naiavf5x.sys, you may also want to uninstall the program using the Control Panel ⇒ Uninstall a ProgramMcAfee VirusScan Enterprise.

Recommended: Identify naiavf5x.sys related errors

Important: Some malware disguises itself as naiavf5x.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the naiavf5x.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

I just blue screened my XP Pro machine and it had mentioned this driver.
This file is not signed by MS. You can find that by running the "sigverif.exe" in the run window.
It is a driver for Network Associates' virus scan console.
WinDbg crash dump analyzer reports it after my XPSP2 blue screened
  Alex   (further information)
Seems to be necessary, but I have uninstalled Mcafee and this is still there, slowing down my bootup (according to Bootvis). Needs further investigation.
It's part of McAfee VirusScan, at least for Enterprise version 8, and probably for other versions as well
I analyze the minidump and show this file in symbol
It is the Mcafee viruscan filter driver
  Laurent   (further information)
belongs to McAfee antivirus software
  Sjoerd Grimmelijkhuizen   (further information)

Rating chart

Summary: Average user rating of naiavf5x.sys: based on 10 votes with 10 user comments. 3 users think naiavf5x.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 2 users suspect danger. One user thinks naiavf5x.sys is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving naiavf5x issues

A clean and tidy computer is the key requirement for avoiding problems with naiavf5x. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the naiavf5x.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

naiavf5x.sys [all]