What is EntDrv51?

The genuine EntDrv51.sys file is a software component of McAfee VirusScan Enterprise by McAfee.
EntDrv51.sys is a system driver for the McAfee VirusScan Enterprise, a security software program for large organizations that protects computer and networks from malicious programs and other online threats. Drivers enable hardware components to communicate with software without additional programming from the software developer. This file is a critical component and should not be directly removed. Removing this file may cause problems while running McAfee products. The McAfee VirusScan Enterprise lets companies manage antivirus software on multiple computers. The enterprise edition consists of a client application installed on all computers on the network, and a server application, responsible for monitoring and updating all client applications. The ePolicy Orchestrator, a unified console that can manages VirusScan controls all client systems. McAfee, Inc. (formerly Network Associates Inc.) is the world's largest company dedicated solely to the development and distribution of security software. It is headquartered in Santa Clara, California, USA. McAfee was founded in 1987 by John McAfee, who later left the company in 1994. Intel bought over McAfee on February 28, 2011 for $7.68 billion.

EntDrv51 stands for McAfee VirusScan Enterprise Driver Version 5.1

EntDrv51.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 EntDrv51.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for EntDrv51 drivers in need of updating

EntDrv51.sys file information

The process known as EntDrv belongs to software Virus Scan Enterprise, Entercept or VirusScan or McAfee VirusScan Enterprise by Network Associates ( or McAfee (

Description: EntDrv51.sys is not essential for the Windows OS and causes relatively few problems. The EntDrv51.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 8,448 bytes (75% of all occurrences) or 8,320 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. It is not a Windows system file. EntDrv51.sys appears to be a compressed file. Therefore the technical security rating is 36% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you are having problems with EntDrv51.sys, you can safely remove the program using the uninstall program of McAfee VirusScan Enterprise (Control Panel ⇒ Uninstall a Program).

Recommended: Identify EntDrv51.sys related errors

Important: Some malware disguises itself as EntDrv51.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the EntDrv51.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 use Mcafee antivirus
page fault in nonpaged area

Summary: Average user rating of EntDrv51.sys: based on 1 vote with 2 user comments. One user thinks it's probably harmless. One user is not sure about it.

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Best practices for resolving EntDrv51 issues

A clean and tidy computer is the key requirement for avoiding problems with EntDrv51. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the EntDrv51.sys process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

EntDrv51.sys [all]