What is tmactmon?

Tmactmon.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc. The free file information forum can help you determine if tmactmon.sys is a Windows system file or if it belongs to an application that you can trust.

Run a free scan to check for tmactmon drivers in need of updating

Tmactmon.sys file information

The process known as TrendMicro Activity Monitor Module belongs to software Trend Micro Internet Security or Trend Micro Eyes by Trend Micro (

Description: Tmactmon.sys is not essential for the Windows OS and causes relatively few problems. The file tmactmon.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 52,496 bytes (60% of all occurrences), 103,416 bytes or 74,600 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. The tmactmon.sys file is a Verisign signed file. It is certified by a trustworthy company. The tmactmon.sys file is not a Windows system file. The software can be uninstalled in the Control Panel. There is no description of the program. Tmactmon.sys is able to record keyboard and mouse inputs. Therefore the technical security rating is 8% dangerous.

Uninstalling this variant: In case of problems with tmactmon.sys, you can also completely remove Trend Micro Internet Security (Control Panel ⇒ Uninstall a Program).

Recommended: Identify tmactmon.sys related errors

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

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

tmactmon.sys [all]