What is alcmtr.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 alcmtr.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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Alcmtr.exe file information

Windows Task Manager with alcmtr
Alcmtr.exe process in Windows Task Manager

The process known as Realtek Azalia Audio - Event Monitor or Realtek (version AC97 Audio - Event Monitor) belongs to software Realtek (version AC97 Audio - Event Monitor) by Realtek Semiconductor (

Description: Alcmtr.exe is not essential for the Windows OS and causes relatively few problems. The alcmtr.exe file is located in the C:\Windows folder. Known file sizes on Windows 10/8/7/XP are 69,632 bytes (73% of all occurrences), 57,344 bytes and 6 more variants. 
The file is not a Windows core file. The program starts upon Windows startup (see Registry key: MACHINE\Run, Run). The alcmtr.exe file is a Microsoft signed file. The program has a visible window. Therefore the technical security rating is 6% dangerous, however you should also read the user reviews.

Recommended: Identify alcmtr.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as alcmtr.exe, for example WS.Reputation.1 or Trojan Horse (detected by Symantec), and TROJ_COSMU.BE (detected by TrendMicro). Therefore, you should check the alcmtr.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

Soundcard drivers. There is always the possibility that spyware can mask itself as this, but there will be other signs if that is the case. Not malicious.
  A R  
Could be a spyware/virus and my anti-virus detected it as a virus(rogueprogram.malwaredoctor).
adobe gamma loader.exe
Part of the RealTek Audio software that comes with your RealTek Audio Card. It is needed to let hardware function, but not essential. You do need it for updates. Best solution: just MSCONFIG it out of the StartUp but let is be (no DEL). No necessary but gives you more resources ;-)
Monitors for hardware being plugged into soundcard (eg microphone/headphones) and i think displays a little balloon message saying it detected headphones being inserted...totally useless if you ask me,. NOT SPYWARE NOT ADWARE NOT A VIRUS..and not being used to gather data about customers. PULL YOUR HEAD IN YOU FOOM'S!!
This is not a driver file. Without it, you will stil have sound. I have had it disabled for quite some time with no problems. My soundcard still recognizes what is plugged into it without a restart by starting the software manually. It is not needed on startup, you may disable it safely, but this is NOT malware.
Is needed for automatic rerouting audio to HDMI if connected
It monitors your sound ports to see if you plug something in. It may also report some data back to Realtek at some point. It's harmless. If you want rid of it, preent it from starting rather than deleting it.
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Rating chart

Summary: Average user rating of alcmtr.exe: based on 38 votes with 9 reviews. 21 users think alcmtr.exe is essential for Windows or an installed application. 9 users think it's neither essential nor dangerous. 7 users suspect danger. One user thinks alcmtr.exe is dangerous and recommends removing it. 2 users don't grade alcmtr.exe ("not sure about it").

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Best practices for resolving alcmtr issues

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

alcmtr.exe [all]