What is mcmnhdlr.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the mcmnhdlr.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Mcmnhdlr.exe file information

Windows Task Manager with mcmnhdlr
Mcmnhdlr.exe process in Windows Task Manager

The process known as McAfee VirusScan Command Handler belongs to software McAfee VirusScan by McAfee ( or Networks Associates Technology (

Description: Mcmnhdlr.exe is not essential for the Windows OS and causes relatively few problems. Mcmnhdlr.exe is located in a subfolder of "C:\Program Files"—generally C:\Program Files\\vso\. Known file sizes on Windows 10/8/7/XP are 151,552 bytes (50% of all occurrences), 139,264 bytes or 167,936 bytes. 
The program has a visible window. The file is not a Windows core file. The application starts when Windows starts (see Registry key: MACHINE\Run). Therefore the technical security rating is 26% dangerous, however you should also read the user reviews.

Recommended: Identify mcmnhdlr.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as mcmnhdlr.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the mcmnhdlr.exe 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

This belongs to McAfee Virus Scanner, but seems to be having a problems.
  gary bennett  
mcmnhdlr.exe is vital process for McAfee SecurityCenter and Virusscan Online. Removing this process will dissable the automatic scanning
  Elric Ward part of McAfee internet suite
command, used with "/runtask;0" will scan a file
Part of McAfee, an inferior anti-virus program that will often interfere with the iTunes application opening.

Rating chart

Summary: Average user rating of mcmnhdlr.exe: based on 9 votes with 5 user comments. 5 users think mcmnhdlr.exe is essential for Windows or an installed application. One user thinks it's probably harmless. 2 users think it's neither essential nor dangerous. One user thinks mcmnhdlr.exe is dangerous and recommends removing it. One user is not sure about it.

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Best practices for resolving mcmnhdlr issues

A clean and tidy computer is the key requirement for avoiding problems with mcmnhdlr. 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 mcmnhdlr.exe 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

mcmnhdlr.exe [all]