What is NSMdtr.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 NSMdtr.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 NSMdtr.exe related errors

NSMdtr.exe file information

The process known as Norton Internet Security Mediator belongs to software Norton Internet Security by Symantec (

Description: NSMdtr.exe is not essential for the Windows OS and causes relatively few problems. NSMdtr.exe is located in a subfolder of "C:\Program Files\Common Files". Known file sizes on Windows 10/8/7/XP are 119,952 bytes (71% of all occurrences) or 120,448 bytes. 
The program has no visible window. You can uninstall this program in the Control Panel. NSMdtr.exe is a Verisign signed file. The file has a digital signature. NSMdtr.exe is not a Windows system file. Therefore the technical security rating is 10% dangerous.

Uninstalling this variant: If you run into problems with NSMdtr.exe, you can uninstall the program using the Control Panel ⇒ Uninstall a ProgramNorton Internet Security.

Recommended: Identify NSMdtr.exe related errors

If NSMdtr.exe is located in the C:\Windows\System32 folder, the security rating is 36% dangerous. The file size is 61,445 bytes. The program has a visible window. The program has no file description. The software starts when Windows starts (see Registry key: MACHINE\Run). The NSMdtr.exe file is not a Windows core file. NSMdtr.exe appears to be a compressed file.

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


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Best practices for resolving NSMdtr issues

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

NSMdtr.exe [all]