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Is msiexec.exe safe?

Msiexec.exe is a executable file (a program) within Windows. The filename extension .exe denotes an executable file. You should only run executable files from publishers you trust, because executable files can potentially change your computer settings or harm your computer. The free file information forum can help you determine if msiexec.exe is a virus, trojan, spyware, or adware that you can remove, or a file belonging to a Windows system or to an application you can trust.

Msiexec.exe file information

The process known as Windows installer belongs to software Windows Installer - Unicode or prjTRCrack or CRACK by Microsoft (www.microsoft.com).

Description: The original msiexec.exe is an important part of Windows and rarely causes problems. msiexec.exe is located in the folder C:\Windows\System32. Known file sizes on Windows 7/XP are 78,848 bytes (73% of all occurrences), 77,312 bytes and 33 more variants. http://www.file.net/process/msiexec.exe.html 
The program is not visible. Msiexec.exe is a trustworthy file from Microsoft. Therefore the technical security rating is 10% dangerous; however you should also read the users reviews.
If problems with Windows Installer Component occur, you can also remove the entire program using Windows Control Panel, go to the support area of the Microsoft website or verify that you have installed the latest version.

Recommended: Identify msiexec.exe related errors

If msiexec.exe is located in a subfolder of C:\Windows, the security rating is 36% dangerous. The file size is 73,216 bytes (41% of all occurrences), 24,576 bytes and 4 more variants. The program is not visible. The file is a trustworthy file from Microsoft. Msiexec.exe is able to monitor applications.

If msiexec.exe is located in a subfolder of "C:\Documents and Settings", the security rating is 48% dangerous. The file size is 142,848 bytes (33% of all occurrences), 11,264 bytes or 889,856 bytes. There is no description of the program. The program is not visible. The file is not a Windows system file. The process is loaded during the Windows boot process (see Registry key: HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Runonce, HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce).

If msiexec.exe is located in the Windows Temp folder, the security rating is 56% dangerous. The file size is 47,616 bytes.

If msiexec.exe is located in a subfolder of "C:\Program Files", the security rating is 16% dangerous. The file size is 78,848 bytes.

Important: Some malware camouflages itself as msiexec.exe, for example Backdoor.Win32.DarkKomet.lhu or Trojan-Clicker.Win32.Agent.tg (detected by Kaspersky), and Mal/Behav-105 (detected by Sophos). Therefore, you should check the msiexec.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 the windows update

  Rodger   (further information)
You should not delete this executeable as it's the windows-installer used to install .msi files. When you're installing/de-installing something it will also show up as a process on your pc.
I found it after downloading the latest version of Free AVG , I think it is a windows update installer
This is a process or program used to install the software package from .msi file, ie microsoft software package. its system process, and NOT dangerous. Thank You
only runs when you install a program with an MSI extension. totally safe.
  Janice Cho-Chu  
This file is not inherently a threat. This file, as many have said before, is responsible for handling the extraction and setup of .MSI installer packages. .MSI = MicroSoft Installer. Msiexec.exe = MSI execution handler. If this is showing up as malware, it is because your system is infected and the msiexec has been corrupted by a virus or malware.
updates with the .net framework that comes with games and smokes your memory bus
  george jetsaid  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of msiexec.exe: based on 94 votes with 9 reviews.
55 users think msiexec.exe is essential for Windows or an installed application. 7 users think it's probably harmless. 12 users think it's neither essential nor dangerous. 7 users suspect danger. 13 users think msiexec.exe is dangerous and recommend removing it. 24 users don't grade msiexec.exe ("not sure about it").

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Msiexec scanner

Security Task Manager shows all running Windows tasks including embedded hidden functions (e.g. keyboard or browser monitoring, autostart entry). A unique security risk rating indicates the likelihood of the process being potential spyware, malware, keylogger or a Trojan.

Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, trojans, keyloggers, malware and tracking threats from your hard disk. Ideal supplement to Security Task Manager.

SpeedUpMyPC scans, cleans, repairs and optimizes your computer.

Other processes

msiexec.exe [all]