What is msiexec.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 msiexec.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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Msiexec.exe file information

Windows Task Manager with msiexec
Msiexec.exe process in Windows Task Manager

The process known as Windows installer or C63w1f4WS or AED0 belongs to software Windows Installer - Unicode or q5e730L97 or prjTRCrack or lperfvcfed or CRACK by Microsoft ( or Hamrick Software or cfrdrtgbvf.

Description: The original msiexec.exe is an important part of Windows and rarely causes problems. Msiexec.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 8/7/XP are 78,848 bytes (68% of all occurrences), 73,216 bytes and 35 more variants. 
The program is not visible. Msiexec.exe is a trustworthy file from Microsoft. Therefore the technical security rating is 12% dangerous; however you should also read the user 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

Important: Some malware camouflages itself as msiexec.exe, for example Backdoor.Win32.DarkKomet.lhu or (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

safe, basic installer
  Jonáš   (further information)
it is just another backdoor for the NSA
Runs to install Windows Updates (keeps your computer safe and secure with latest updates)
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
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of msiexec.exe: based on 97 votes with 9 reviews. 57 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. 14 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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Best practices for resolving msiexec issues

A clean and tidy computer is the key requirement for avoiding problems with msiexec. 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 doing a repair of your installation, or in the case of Windows 8, 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 msiexec.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

msiexec.exe [all]