What is ATKFUSService.exe?

The genuine ATKFUSService.exe file is a software component of ASUS Fast User Switch Service by ASUSTeK COMPUTER INC.
Fast User Switching provides a way for users to quickly switch between accounts without having to fully log off. The application doesn’t really need to be started and can consume resources. The company name ASUS is dervied from the last four letters of Pegasus, a winged horse in Greek mythology representing the inspiration of art and learning.

ATkFUSService stands for ASUSTek FastUserSwitch Service

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 ATKFUSService.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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ATKFUSService.exe file information

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

The process known as ASUS FUS Service belongs to software ASUS Fast User Switch Service by ASUSTeK COMPUTER INC (

Description: ATKFUSService.exe is not essential for the Windows OS and causes relatively few problems. ATKFUSService.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 61,952 bytes (40% of all occurrences), 60,928 bytes or 67,072 bytes. 
The program has no visible window. It is located in the Windows folder, but it is not a Windows core file. ATKFUSService.exe is not a Windows core file. Therefore the technical security rating is 52% dangerous.

Recommended: Identify ATKFUSService.exe related errors

Important: Some malware disguises itself as ATKFUSService.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the ATKFUSService.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.


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Best practices for resolving ATKFUSService issues

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

ATKFUSService.exe [all]