What is ISSVC.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 ISSVC.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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ISSVC.exe file information

Windows Task Manager with ISSVC
ISSVC.exe process in Windows Task Manager

The process known as IS Service belongs to software Norton Internet Security (version 2005) or Symantec Client Security by Symantec (

Description: ISSVC.exe is not essential for the Windows OS and causes relatively few problems. ISSVC.exe is located in a subfolder of "C:\Program Files"—generally C:\Program Files\norton internet security\ or C:\Program Files\Norton Personal Firewall\. Known file sizes on Windows 10/8/7/XP are 83,584 bytes (83% of all occurrences), 87,728 bytes, 79,488 bytes or 87,680 bytes. 
The program has no visible window. The file is a Verisign signed file. The ISSVC.exe file is digitally signed. ISSVC.exe is not a Windows core file. Therefore the technical security rating is 19% dangerous, however you should also read the user reviews.

Uninstalling this variant: It is possible to do the following:
  • look for help from the software company Norton
  • check the vendor’s website for a newer version
  • uninstall the associated program (Start > Control Panel > Uninstall a Program > Norton Internet Security Suite or Symantec Client Security)

Recommended: Identify ISSVC.exe related errors

External information from Paul Collins:

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

Part of Symantec Norton Internet Security suite
  Georg   (further information)
It is not allowing me to access internet server I chose; be aware that a rating of five is dangerous here!
Simply added when NIS is installed.
Norton Symantc something or other. I trust norton
totaly safe mainpart of norton internett scurity! LEAVE IT running to be safe!
  JuzTo   (further information)
ISSVC.exe is a part of Norton Internet Security Suite and is a vital process for informing you about the latest Internet-bound security threats. This program is important for the stable and secure running of your computer and should not be terminated.
  Ema Nymton  
norton security exe
Its in system32 and Norton Internet Security does not recognise it, so it can't be a Norton file!
Part of Norton, may require setting options within Norton to NOT have it block your own access to the Internet - firewall setting are by default OVER PROTECTIVE!
  Peter Blaise  

Rating chart

Summary: Average user rating of ISSVC.exe: based on 12 votes with 9 user comments. 10 users think ISSVC.exe is essential for Windows or an installed application. 2 users think ISSVC.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving ISSVC issues

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

ISSVC.exe [all]