The genuine AcroIEFavClient.dll file is a software component of Acrobat Reader by Adobe.
Acroiefavclient.dll is an Internet Explorer Add-On for Adobe Acrobat Reader. It allows you to display PDF files directly in your web browser, rather than having to launch Acrobat Reader. It is not a core Windows process, but should only be removed in case it is causing problems. Adobe Acrobat is a group of software and web services created by Adobe, to create, view, modify and print files in the popular Portable Document Format (PDF). Adobe Systems Incorporated is an American software giant established in 1982 in Mountain View, California.
AcroIEfavClient stands for Acrobat Internet Explorer favorite Client
AcroIEFavClient.dll is a browser extension for Internet Explorer. This add-on enables several additional functions for Internet Explorer. You can disable it through the Extras menu (key combination Alt + X) under Manage Add-ons. The following paragraph provides more information about Adobe PDF Toolbar.
The process known as Adobe PDF Toolbar for Internet Explorer or Adobe IE plugin or Adobe Acrobat (version 6.0 Professional, 6.0 Standard, 6.0.1 Professional, 6.0.1 Standard, 6.0 Professional - English, Français, Deutsch, 6.0.1 Professional - English, Français, Deutsch, 6.0 Standard - English, Français, Deutsch, 9 Standard - English, Français, Deutsch, 7.0 Professional, 9 Pro Extended - English, Français, Deutsch) or Adobe Acrobat XI Pro
belongs to software Adobe PDF Toolbar for IE or Adobe Acrobat (version 8 Professional, 9 Pro Extended, 9 Professional, 9 Standard) or Adobe Common File Installer or Adobe IE plugin or Adobe Creative Suite (version 2, 6 Master Collection) or Adobe Photoshop (version CS6, CS2) or Adobe Premiere Elements (version 10 HD) or IPrint
by Adobe Systems (www.adobe.com).
Description: AcroIEFavClient.dll is not essential for the Windows OS and causes relatively few problems. AcroIEFavClient.dll is located in a subfolder of "C:\Program Files"—mostly C:\Program Files\Adobe\Acrobat 6.0\Acrobat\ or C:\Program Files\Adobe\Acrobat 7.0\Acrobat\.
Known file sizes on Windows 10/8/7/XP are 147,456 bytes (55% of all occurrences), 225,280 bytes and 5 more variants.
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include AE7CD045-E861-484f-8273-0445EE161910 or F4971EE7-DAA0-4053-9964-665D8EE6A077. The program is not visible. AcroIEFavClient.dll is able to change the behavior of, or monitor Internet Explorer. The service has no detailed description. AcroIEFavClient.dll is not a Windows system file. You can uninstall this program in the Control Panel. The program has no file description. Therefore the technical security rating is 59% dangerous; however you should also read the user reviews.
Recommended: Identify AcroIEFavClient.dll related errors
External information from Tony Klein:
Important: Some malware camouflages itself as AcroIEFavClient.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the AcroIEFavClient.dll process on your PC to see if it is a threat. If Adobe PDF Toolbar has changed your browser's search engine and start page, you can recover your browser's default settings as follows:Reset default browser settings for Internet-Explorer ▾
The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active AcroIEFavClient process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the AcroIEFavClient.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. 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.