What is AlarmS4.exe?

The genuine AlarmS4.exe file is a software component of Intrusion Alarm by Acer.
AlarmS4.exe is an executable file that runs the Intrusion Alarm, a program that alerts the user in case of unauthorized access into the case of the Acer laptop. The alarm operates regardless of whether the laptop is powered or not. This is not a critical Windows component and should be removed if known to cause problems. Acer was founded in 1976 by Stan Shih, Carolyn Yeh and five others as Multitech in 1976. It is a Taiwanese hardware and electronics giant that produces laptops, desktops, smart phones, displays, storage devices and peripherals. Acer was the fourth largest global vendor of personal computers in 2013 and generates an annual revenue of more than $16 billion. The company is headquartered in Xizhi, New Taipei City, Taiwan.

AlarmS4 stands for Intrusion Alarm Service (version 4)

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 AlarmS4.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.

Click to Run a Free Scan for AlarmS4.exe related errors

AlarmS4.exe file information

Windows Task Manager with AlarmS4
AlarmS4.exe process in Windows Task Manager

The process known as Intrusion Alarm belongs to software Intrusion Alarm by acer (

Description: AlarmS4.exe is not essential for the Windows OS and causes relatively few problems. AlarmS4.exe is located in the C:\Windows\System32 folder. The file size on Windows 10/8/7/XP is 241,664 bytes. 
The program is not visible. AlarmS4.exe is located in the Windows folder, but it is not a Windows core file. AlarmS4.exe is not a Windows core file. The process starts upon Windows startup (see Registry key: MACHINE\User Shell Folders). AlarmS4.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 59% dangerous.

Recommended: Identify AlarmS4.exe related errors

Important: Some malware disguises itself as AlarmS4.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the AlarmS4.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 AlarmS4 issues

A clean and tidy computer is the key requirement for avoiding problems with AlarmS4. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the AlarmS4.exe process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

AlarmS4.exe [all]