MpOav.dll file information
The process known as IOfficeAntiVirus Module belongs to software Microsoft Windows Operating System or Microsoft Malware Protection or Microsoft Security Essentials by Microsoft (www.microsoft.com).
Description: MpOav.dll is not essential for Windows and will often cause problems. MpOav.dll is located in a subfolder of "C:\ProgramData"—normally C:\ProgramData\Microsoft\Windows Defender\platform\4.18.2003.8-0\X86\.
Known file sizes on Windows 10/11/7 are 224,480 bytes (16% of all occurrences), 224,688 bytes and 60 more variants. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior.
The MpOav.dll file is not a Windows system file. The program is not visible. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. The file has a digital signature.
Therefore the technical security rating is 43% dangerous, but you should also take into account the user reviews.
Uninstalling this variant:
You can do the following:
- look for help on the www.microsoft.com website
- safely remove the program using the uninstall program of Microsoft or Microsoft Security Client (Control Panel ⇒ Uninstall a Program)
Recommended: Identify MpOav.dll related errors
Important: Some malware camouflages itself as MpOav.dll. Therefore, you should check the MpOav.dll 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.
Best practices for resolving MpOav issues
A clean and tidy computer is the key requirement for avoiding problems with MpOav. 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 executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To get your computer running as fast as it did on day one, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.
To help you analyze the MpOav.dll 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. A good Bantivirus software detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
Other processes
nvidia web helper.exe plfseti.exe jhi_service.exe MpOav.dll runtimebroker.exe nvxdsync.exe acrotray.exe agent.exe service.exe uns.exe iefdm2.dll [all]
Score
User Comments
Henk.Tech
Summary: Average user rating of MpOav.dll: based on 2 votes with 1 user comment. One user thinks MpOav.dll is essential for Windows or an installed application. One user thinks MpOav.dll is dangerous and recommends removing it. One user is not sure about it.