What is tmon.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 tmon.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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Tmon.exe file information

The process known as tmon.exe belongs to software Ocucom PreCast by Ocucom (

Description: Tmon.exe is not essential for Windows and will often cause problems. Tmon.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,811,120 bytes (50% of all occurrences), 1,807,288 bytes or 1,807,024 bytes. 
Tmon.exe is a file with no information about its developer. The file is not a Windows core file. Tmon.exe is certified by a trustworthy company. The software starts when Windows starts (see Registry key: MACHINE\User Shell Folders). The program has no visible window. Tmon.exe is able to record keyboard and mouse inputs. Therefore the technical security rating is 47% dangerous, however you should also read the user reviews.

Uninstalling this variant: You could uninstall the software Ocucom PreCast using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Recommended: Identify tmon.exe related errors

Important: Some malware camouflages itself as tmon.exe. Therefore, you should check the tmon.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

Possible spyware or shady software. Apparently an online survey executable. Link to it's source is 404'd. (Found info on Windows support forum)
  LirvA   (further information)

Summary: Average user rating of tmon.exe: based on 1 vote with 1 user comment. One user suspects danger.

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Best practices for resolving tmon issues

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

tmon.exe [all]