What is epmworker.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 epmworker.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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Epmworker.exe file information

Windows Task Manager with epmworker
Epmworker.exe process in Windows Task Manager

The process known as CAPI_Worker Module belongs to software Sony Ericsson PC Suite or HTC Sync or CAPI_Worker Module by Teleca Sweden AB ( or Sony Ericsson Mobile Communications AB (

Description: Epmworker.exe is not essential for Windows and will often cause problems. The epmworker.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 880,640 bytes (27% of all occurrences), 872,448 bytes and 4 more variants. 
The program has no visible window. The epmworker.exe file is not a Windows system file. You can uninstall this program in the Control Panel. Therefore the technical security rating is 28% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can do the following:
  • search for help on the company's website
  • uninstall HTC Sync or Sony Ericsson PC Suite from your computer using the Control Panel applet Uninstall a Program

Recommended: Identify epmworker.exe related errors

Important: Some malware camouflages itself as epmworker.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the epmworker.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 SonyEricsson Mobile Phone Monitor
  Jerry   (further information)
CD that comes with Sony mobiles
used for sonyericsson phones
Handles SonyEricsson Mobile Phone connection to the PC. If you have SE Phone software installed, it probably belongs there. Otherwise, it's not legit.
  Johan from Sweden  
sony ericsson pc suite
Sony Ericsson PC suite Program File
Sony Ericsson software file... Obvioulsy be worried if you haven't installed any Sony Ericsson phone software recently
Installed from the Sony Ericsson cd for mobile phone monitoring. Sometimes causes probs with dvd playback.
stated running after Sonyerricson k800 pc suit load
This process maybe harmless/useless, but it uses up a hell of a lot of resoureces. Keeping your processor running constantly for nothing!
Used for Sony Ericsson phones
Installed with Sony Ericsson PC Suite. was consuming a lot of CPU time on my machine although no phone was connected. Had to kill the exe through task manager after which the performance improved.
yes, comes with sonyericsson phonesoftware
SonyEricsson uses it to detect a phone connection via USB. The file is constantly using up a percentage of your CPU and can cause lags. Remove the file from startup if so and start the software manually.   (further information)
It makes an active window not active for 2-3 seconds, every 10 seconds. On my pc it is impossible to type anything, while this process is working, because when the window is inactive for few seconds, it doesn't accept letters you type. After killing this process, everything is working properly, but I can't synchronize my SonyEricsson phone with my pc anymore. I'm using WinXP and other ORIGINAL software.
It is spyware
  george   (further information)
It seems to cause short "freezes" in my system
Got the sony ericsson k790i, and epmworker.exe running in the taskmanager, it lacks my system, although I got a 3.0 P4 CPU, 4x512 megabyte pc3200 Dual-ch. 2x74 Gigs WD Raptor (Raid0), and Asus 9800XT AGP card, it lacks my com, badly!
Sony Ericsson Software
rapidly slows down the system..
sonyericsson phone app
  from sweden  
its for sony ericson phones to connect to you pc, i would advise to kill it if your not using it to connect your phone as it checks for phone connectivity approximatly every 15 secounds and will make your computer jerk for a second each time it serches for a device.
synchronize sony phone with pc
It's part of th Sony Ericsson Phone Kit, but It can cause video stuttering and audio problems if it becomes corrupt. A full uninstall is necessary to fix the problem.
It came with my Sony Ericsson W880i PC suite and is required to connect the phone to the PC via Bluetooth or cable.
sony ericcson
Ericsson Phone Monitor. Causes my system to freeze briefly every few seconds. Sony Ericsson PC Suite seems to function without it.
  Mikel Ward  
Happens since i've installed Sony Ericsson software.
Appeared after installing Data Suite for Sony Ericsson. Cancelled on Task Manager, not critical at all
Sony PC Suite!
SonyEricsson PC Suite, its recomended to Install MyPhoneExplorer:
  Godi   (further information)
I Regulaly shut it down when wanting to view video or stop my computer pausing during scrolling., othewise is no harm to the computer although requiedAlways restarts on activation of the systempausing my comp to
Opens and closes every few seconds the COM-port where it expects the Phone - stupid!
sonyericcson pc suit seems to be efecting explorer.exe cannot remove or turn off
Belongs to SE phone pc suit
As far as i concerned it comes with Sony ericsson PC suit that i have instaled on my pc.
  Hebert Borelly  
installed sony K750i software
Sony Ericsson k750i file. Wastes a lot of resources
Part of the Sony Ericsson Mobile Phone Monitor application
  BubbleNut   (further information)
associated to k800i sonyericsson drivers. how 2 remove it, dunno.
epmworker slowed youtube video's, in win95 compatible mode no mre problems
Sony ericson phone, you can just close it, nothing seems to happen, it starts up again if you open up the phone program
From what I've seen, it seems to remove focus from whatever you're working on, Very annoying for when typing out long documents! As soon as I stopped it my focus stayed so my advice is to go onto task manager and stop the process.
Sony Ericsson PC Suite
  SWEPAL   (further information)
This file slowed down my PC; it was using 99% of my PCs resources, until I exited the Sony Ericsson PC Suite
  Harish Patel  
it turn off my pc
its a real pain in vista 32bit,causes machine to slow right down and even crash quite often.Better off just installing drivers and acessing phone by drag and drop!What is Sony doing?
It slows my wireless connection considerably, almost to standstill at times, throu trial and error i identified this process
Recently i had slide show on my desktop after starting computer. When I closed epm worker by ctrl+alt+del, freezes stopped immediately. Just turn it off...
saya belum mengetahui tentang file ini
It was causing noise in my headphones on Windows 7. I don't have SE installed. I found it by going through shutting down tasks until the noise went away.
  Joe J  
It appeared after I installed HTC Sync for my HTC Desire and everything slowed dow.
part of HTC Mobile Phone Monitor
HTC EVO software

Rating chart

Summary: Average user rating of epmworker.exe: based on 62 votes with 54 user comments. 18 users think epmworker.exe is essential for Windows or an installed application. 6 users think it's probably harmless. 28 users think it's neither essential nor dangerous. 8 users suspect danger. 2 users think epmworker.exe is dangerous and recommend removing it. 7 users don't grade epmworker.exe ("not sure about it").

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Best practices for resolving epmworker issues

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

epmworker.exe [all]