What is semon21.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 semon21.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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Semon21.exe file information

The process known as talk&surf (version 6.0) belongs to software talk&surf or SEMon21 by Siemens AG (

Description: Semon21.exe is not essential for the Windows OS and causes relatively few problems. The semon21.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 172,032 bytes (66% of all occurrences) or 163,840 bytes. 
There is an icon for this program on the taskbar next to the clock. The program has a visible window. There is no description of the program. Semon21.exe is not a Windows core file. The application can be uninstalled in the Control Panel. Therefore the technical security rating is 11% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with semon21.exe come up, you can ask Customer Support to assist you, update to a possibly corrected version or completely remove talk&surf (Control Panel ⇒ Uninstall a Program).

Recommended: Identify semon21.exe related errors

Important: Some malware camouflages itself as semon21.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the semon21.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

Gehört zur Telekom/Siemens Gigaset xxx / 721X
Das Programm habe ich mir reingezogen ais ich auf einen windws 7-Rechner talk & surf von Siemens geladen habe. Ich konnte hinterher den Rechne nicht mehr ausschalten.
  Günther Bsteh  

Summary: Average user rating of semon21.exe: based on 2 votes with 2 user comments. One user thinks semon21.exe is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving semon21 issues

A clean and tidy computer is the key requirement for avoiding problems with semon21. 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 semon21.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

semon21.exe [all]