What is Nmain.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 Nmain.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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Nmain.exe file information

The process known as Symantec Integrator or Norton Integrator belongs to software Client and Host Security Platform or Norton AntiVirus (version 2002) by Symantec (

Description: Nmain.exe is not essential for the Windows OS and causes relatively few problems. The file Nmain.exe is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 545,984 bytes (33% of all occurrences), 701,560 bytes or 824,944 bytes. 
Nmain.exe is not a Windows system file. You can uninstall this program in the Control Panel. The file is a Verisign signed file. Nmain.exe is certified by a trustworthy company. The program has a visible window. Nmain.exe is able to record keyboard and mouse inputs, hide itself and monitor applications. Therefore the technical security rating is 0% dangerous, however you should also read the user reviews.

Uninstalling this variant: It is possible to uninstall Norton AntiVirus 2002 or ccCommon from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify Nmain.exe related errors

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

nmain.exe has been using 97% or so of my system resourses - that is CPU power. I am not sure if it is a real file or if there is something wrong - but I cannot run other aplications unless I close this process.
u must have norton antivirus installed as it is a needed file for norton antivirus email scanning
  kr4zy h4ck3r  
it runs only when norton window is open...
it looks like its some how related to nortons anti virus software
nmain.exe is a process belonging to the Norton AntiVirus Internet security product, a product which protects your computer from Internet-bound viruses. This program is important for the stable and secure running of your computer and should not be terminated.
No more than I have seen here, my file is 824924 bytes, similar to what is described here, & only one of them on search
  A Aukamp  
As soon as i decided to block a port from accessing the internet, the NMain.exe tried so use the Norton antivirus to access the internet. It seemed kind of odd... Was it trying to alert someone of the changes i had made???
It IS related to Norton. I'm using GoBack 4 and whenever gobacks icon is in the system tray or i have the App. open and am fiddlin' then it's in my processes. on my other puter it wasn't there until i installed Norton.
Runs when Norton is run
  George Berger - FC  

Rating chart

Summary: Average user rating of Nmain.exe: based on 13 votes with 9 user comments. 8 users think Nmain.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. 2 users suspect danger. One user is not sure about it.

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Best practices for resolving Nmain issues

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

Nmain.exe [all]