What is OAmon?

OAmon.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 OAmon.sys is a Windows system file or if it belongs to an application that you can trust.

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

OAmon.sys file information

The process known as TDI Helper Driver or OAmon belongs to software Online Armor Firewall or OAmon by Emsisoft ( or Tall Emu Pty (

Description: OAmon.sys is not essential for the Windows OS and causes relatively few problems. OAmon.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 24,656 bytes (33% of all occurrences), 25,192 bytes, 30,920 bytes, 32,456 bytes or 25,600 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program has no visible window. There is no detailed description of this service. It is not a Windows system file. OAmon.sys is digitally signed. Therefore the technical security rating is 32% dangerous, however you should also read the user reviews.

Recommended: Identify OAmon.sys related errors

If OAmon.sys is located in a subfolder of C:\Windows, the security rating is 34% dangerous. The file size is 40,520 bytes. The program has no visible window. The file has a digital signature. The service has no detailed description. It is not a Windows core file. OAmon.sys appears to be a compressed file.

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


User Comments

part of Online Armor firewall
  me   (further information)

Summary: Average user rating of OAmon.sys: based on 1 vote with 1 user comment. One user thinks OAmon.sys is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving OAmon issues

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

OAmon.sys [all]