What is TNBUtil.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 TNBUtil.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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TNBUtil.exe file information

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

The process known as tnbutil or TNBUtil belongs to software F-Secure Try & Buy Utility or F-Secure CUIF by F-Secure (

Description: TNBUtil.exe is not essential for the Windows OS and causes relatively few problems. TNBUtil.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 2,349,664 bytes (21% of all occurrences), 957,024 bytes and 16 more variants. 
The program has a visible window. The software starts upon Windows startup (see Registry key: MACHINE\Run). TNBUtil.exe is not a Windows system file. The file has a digital signature. It is a Verisign signed file. TNBUtil.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 9% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of problems with TNBUtil.exe, you can uninstall the associated program (Start > Control Panel > Uninstall a Program > F-Secure Anti-Virus Client or F-Secure).

Recommended: Identify TNBUtil.exe related errors

External information from Paul Collins:

Important: Some malware camouflages itself as TNBUtil.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the TNBUtil.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 F-Secure needed for anti-virus protection. The error message if the installation was not complete. Re-install anti-virus and the message will not show anymore, and you will get protection.
  C.B. Villeneuve  
tnbutil.exe belongs to F-Secure antivirus develop by F-Secure
If you had a service like Embarq and now have another, and TNBUtil. exe is causing a problem, try going into the control panel,administrative tools, computer management, services and applications, services, and remove or disable anything from F-span. It isn't a bad program, but the error message is annoying.

Summary: Average user rating of TNBUtil.exe: based on 2 votes with 3 user comments. 2 users think TNBUtil.exe is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving TNBUtil issues

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

TNBUtil.exe [all]