What is nisserv.exe?

The genuine nisserv.exe file is a software component of Norton Internet Security by Symantec.
"nisserv.exe" is an essential component of Norton Internet Security. This file handles the operation of each application within the Norton Internet Security Suite. If this file is deleted and disabled in any way, the software will not function correctly. In addition, this file is used by third-party software like Windows Security Essentials and should not be disabled. Symantec is a leader in internet security, focused on protecting computers, tablets, mobile phones, and more from malware, viruses, dangerous websites, and more.

NISServ stands for Norton Internet Security Service

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 nisserv.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.

Click to Run a Free Scan for nisserv.exe related errors

Nisserv.exe file information

The process known as IAMSERV.EXE belongs to software Norton Internet Security or Symantec Client Firewall or Norton Personal Firewall Service by Symantec (

Description: Nisserv.exe is not essential for the Windows OS and causes relatively few problems. Nisserv.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of C:\. Known file sizes on Windows 10/8/7/XP are 63,144 bytes (76% of all occurrences), 62,592 bytes, 63,096 bytes or 79,064 bytes. 
The program has no visible window. The file is a Verisign signed file. The file is certified by a trustworthy company. The nisserv.exe file is not a Windows core file. Nisserv.exe is able to hide itself. Therefore the technical security rating is 20% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you have any problems with nisserv.exe, you can safely remove the program using the uninstall program of Norton Personal Firewall or Acoustica Effects Pack (Control Panel ⇒ Uninstall a Program).

Recommended: Identify nisserv.exe related errors

External information from Paul Collins:

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

Norton Internet Security process. Leave alone if you want your Norton to work properly
  Darren O'Brien  
Part of Windows "free" anti-virus. \Microsoft Security Client\Antimalware folder
  Mark Snow  
Microsoft Security Essentials
  no   (further information)
Antimalware uses it as well. Seems to be some kind of firewall file
nisServ.exe is part of Microsoft Security Client Antimalware also known as Microsoft Network Inspection System located in \Program Files\Microsoft Security Client\Antimalware with a size of 204 KB (208,944 bytes), size on disk 208 KB (212,992 bytes) when you right click on it and select properties. If you're looking at it in the folder itself it may show as 205 KB.

Summary: Average user rating of nisserv.exe: based on 7 votes with 5 user comments. 7 users think nisserv.exe is essential for Windows or an installed application.

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Best practices for resolving nisserv issues

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

nisserv.exe [all]