What is OADriver?

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

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

OADriver.sys file information

The process known as OADriver or OA Helper Driver belongs to software OADriver or OA Helper Driver by Emsi Software GmbH ( or Tall Emu Pty ( or Tall Emu (

Description: OADriver.sys is not essential for the Windows OS and causes relatively few problems. The OADriver.sys file is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 80,584 bytes (21% of all occurrences), 202,064 bytes and 7 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. There is no detailed description of this service. The file is not a Windows core file. There is no information about the author of the file. OADriver.sys is able to record keyboard and mouse inputs. Therefore the technical security rating is 41% dangerous, however you should also read the user reviews.

Recommended: Identify OADriver.sys related errors

If OADriver.sys is located in a subfolder of C:\Windows, the security rating is 0% dangerous. The file size is 54,864 bytes (33% of all occurrences), 61,632 bytes or 59,176 bytes. User opinion: not dangerous There is no file information. The program has no visible window. The file is certified by a trustworthy company. There is no detailed description of this service. It is not a Windows core file. OADriver.sys is a Verisign signed file. OADriver.sys appears to be a compressed file.

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

Seems to be related to Tall Emu Firewall
Online Armor firewall driver
  meetoo   (further information)

Summary: Average user rating of OADriver.sys: based on 1 vote with 2 user comments. One user thinks OADriver.sys is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving OADriver issues

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

OADriver.sys [all]