What is CLMLService.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 CLMLService.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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CLMLService.exe file information

Windows Task Manager with CLMLService
CLMLService.exe process in Windows Task Manager

The process known as Cyberlink MediaLibrary NT Service belongs to software Cyberlink MediaLibrary NT Service or ACD/Labs Software in by Cyberlink (

Description: CLMLService.exe is not essential for Windows and will often cause problems. The CLMLService.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 737,381 bytes (39% of all occurrences), 1,077,376 bytes, 737,379 bytes or 737,370 bytes. 
The program has no visible window. The file is not a Windows core file. The application uses ports to connect to or from a LAN or the Internet. Therefore the technical security rating is 60% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can ask for help from Support, make sure that you have installed the latest version or safely remove the program using the uninstall program of Cyberlink MediaLibrary NT Service (Control Panel ⇒ Uninstall a Program).

Recommended: Identify CLMLService.exe related errors

Important: Some malware camouflages itself as CLMLService.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the CLMLService.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

Seems to be the resident part of the Cyberlink Power cinema platform. In my case preinstalled with the OEM set of applications on a new system.
  Alexander Boelen   (further information)
It's a power cinema service or also know as DVD player
It caused massive amounts of UDP connections to be opened (observed with SysInternals' TCPView), possibly flooding my connection limit and thus causing "weird" cannot connect errors in other programs.
  Niels Huylebroeck  
It appears to be part of Cyberlink software as supplied with Mesh computers. Mesh are unable to assist regarding its habbit of grabbing the WHOLE of the CPU time. Clear it from the startup boc via msconfig.
is part of power dvd safe to remove just want update online libary
It's certainly Cyberlinks "Power Suite" if it loads at startup and you have the shortcut menu bar tower loading on your desktop it will gobble up all your processor power. If your machine is running slow check "running processes" in Win Task Manager, If CLMLservice is there you can bet its gobbling 90% of your CPU. Dump it and install a kinder program or at least dont let it start with windows.
  Steve Rickman  
Cyberlink Media Library Service
As stated by Mr. Boelen this is part of Cyberlink Power Cinema for example. It seems the port it listens to is used to look for other Cyberlink installations. Check CLMLServer.exe and CLCapSvc.exe (Capture Service for Video...), as well. You have to decide if you need this feature (Media Server streams), if not you may deactivate them via msconfig.
Niels Huylebroeck's description above rings most true. Task Manager doesn't show CPU or RAM use to be the root of the problem - it is CONNECTIONS.
Commonly part of the collection of pre-packaged OEM software deployed on laptops from companies like Gateway, HP, etc. In Windows "Startup" by default and can be disabled in MSCONFIG. Used for managing webcam, audio, video, and other media.
Eats lots of CPU during compiling
It uses a lot of system resources and internet connections but does not seem to provided any user benefit in return, probably collecting personal info and sending it back to cyberlink. It supposedly collects info on the movies you watch but does not say how this is supposed to be any benefit to you.

Rating chart

Summary: Average user rating of CLMLService.exe: based on 17 votes with 12 user comments. 8 users think CLMLService.exe is essential for Windows or an installed application. 6 users think it's neither essential nor dangerous. 2 users suspect danger. One user thinks CLMLService.exe is dangerous and recommends removing it.

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Best practices for resolving CLMLService issues

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

CLMLService.exe [all]