What is nnrun.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 nnrun.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 nnrun.exe related errors

Nnrun.exe file information

The process known as runner belongs to software Domains or runner by (

Description: Nnrun.exe is not essential for the Windows OS and causes relatively few problems. Nnrun.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 3,584 bytes (47% of all occurrences), 3,072 bytes or 5,120 bytes. 
The program is not visible. The file is not a Windows core file. It can change the behavior of other programs or manipulate other programs. Therefore the technical security rating is 65% dangerous.

Uninstalling this variant: If problems with Domains come up, you can also completely remove it (Control Panel ⇒ Uninstall a Program).

Recommended: Identify nnrun.exe related errors

Important: Some malware also uses the file name nnrun.exe, for example TROJ_Generic.DIM (detected by TrendMicro), and not-a-virus:AdWare.Win32.OneStep.c (detected by Kaspersky). Therefore, you should check the nnrun.exe process on your PC to see if it is a threat. If runner has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving nnrun issues

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

nnrun.exe [all]