What is opt_out.dll?

The genuine opt_out.dll file is a software component of Google Advertising Cookie Opt-out plugin by Google.
Opt_out.dll is a DLL (Dynamic Link Library) file that belongs to the Advertising Cookie Opt-out plugin, a browser plugin that lets users permanently opt out of the DoubleClick cookie, an advertising cookie used by Google. DLL files store data, code and resources needed by one or more programs in order to function correctly. This file is a Browser Helper Object (BHO) that adds program functionality to Microsoft's Internet Explorer and other Internet browsers. This is not a critical Windows component and should be removed if known to cause problems. Google was founded in 1998 by Larry Page and Sergey Brin, Ph.D. students at Stanford. Google has since grown into one of the biggest companies in the world, offering hundreds of services, including webmail (Gmail), cloud storage (Google Drive), office software (Google Docs) and social networking services (Google+). Alexa, which provides web traffic data, lists Google as the world's most visited website. Its popularity has led to huge media coverage, including a major critique of the company over copyright, censorship, and privacy issues. Google is headquartered in Googleplex, Mountain View, California, USA.

opt_out stands for Google Advertising Cookie Opt-out

Opt_out.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 Google Advertising Cookie Opt-out.

Click to Run a Free Scan for opt_out.dll related errors

Opt_out.dll file information

The process known as Google Advertising Cookie Opt-out belongs to software Advertising Cookie Opt-out or Google Désactivation du cookie by Google (

Description: Opt_out.dll is not essential for the Windows OS and causes relatively few problems. Opt_out.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 304,624 bytes (56% of all occurrences) or 309,200 bytes. 
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 8E425EB4-ADBD-4816-B1E8-49BB9DECF034. The process has no file description. The program has no visible window. It is a Verisign signed file. It is able to change the behavior of, or monitor Internet Explorer. Opt_out.dll is certified by a trustworthy company. The file is not a Windows system file. The software can be removed using the Control Panel's Add\Remove programs applet. Therefore the technical security rating is 30% dangerous.

Uninstalling this variant: You can uninstall Google Advertising Cookie Opt-out or Win AVI HelixSDK, or ask Support team for help. Go to Google Advertising Cookie Opt-out or Win AVI HelixSDK in the Windows Control Panel (Software or Programs section) to uninstall it, or go to for Customer Support.

Recommended: Identify opt_out.dll related errors

Important: Some malware camouflages itself as opt_out.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the opt_out.dll process on your PC to see if it is a threat. If Google Advertising Cookie Opt-out 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 ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving opt_out issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active opt_out process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the opt_out.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 cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

opt_out.dll [all]