What is pcsws.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 pcsws.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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Pcsws.exe file information

The process known as PCSWS.EXE belongs to software IBM Personal Communications or IBM iSeries Access for Windows by IBM (

Description: Pcsws.exe is not essential for the Windows OS and causes relatively few problems. Pcsws.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 751,104 bytes (25% of all occurrences), 842,281 bytes, 612,864 bytes or 803,328 bytes. 
Pcsws.exe is not a Windows core file. Therefore the technical security rating is 24% dangerous; however you should also read the user reviews.

Uninstalling this variant: If problems with IBM iSeries Access for Windows or IBM iSeries Access für Windows occur, you could also safely remove the program using the uninstall program of (Control Panel ⇒ Uninstall a Program).

Recommended: Identify pcsws.exe related errors

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

This is the AS/400 Terminal Emulator in IBM iSeries Acces for Windows (aka IBM Client Access)
It is part of IBM's Personal Communications (PCOMM)
Für AS/400 Sitzungen notwendig
tThis is not malware, it's an AS/400 process that if you terminate will not allow you to run AS/400 connections until you reboot.
  Gideon J.  
Das Programm wird für Terminalsitzungen auf einer AS400 benötigt.
AS 400 Sitzung 5250 Emulation
pcsws.exe process is running and application is not opening.Its open only in admin profile.
It's necessary for IBM I Series Access

Rating chart

Summary: Average user rating of pcsws.exe: based on 11 votes with 8 user comments. 10 users think pcsws.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving pcsws issues

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

pcsws.exe [all]