What is un.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 un.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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Un.exe file information

The process known as un.exe appears to belong to software AppHelper or Command AntiVirus for Windows by Authentium (

Description: Un.exe is not essential for the Windows OS and causes relatively few problems. Un.exe is located in the Windows folder for temporary files. The file size on Windows 10/8/7/XP is 3,714,048 bytes. 
There is no description of the program. The program has no visible window. The un.exe file is not a Windows core file. Therefore the technical security rating is 84% dangerous.

Recommended: Identify un.exe related errors

If un.exe is located in a subfolder of "C:\Program Files", the security rating is 24% dangerous. The file size is 118,784 bytes. The program has a visible window. There is no description of the program. Un.exe is not a Windows system file. The process listens for or sends data on open ports to a LAN or the Internet.

Important: Some malware also uses the file name un.exe, for example Trojan.Win32.Agentb.brad (detected by Kaspersky), and ADW_AppHelper (detected by TrendMicro). Therefore, you should check the un.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 un issues

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

un.exe [all]