What is PopUpKiller.dll?

PopUpKiller.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 McAfee Popup Blocker.

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PopUpKiller.dll file information

The process known as PopUpKiller Module or McAfee Privacy Service Internet Explorer Popup Blocker belongs to software PopUpKiller Module or McAfee Privacy Service by McAfee (

Description: PopUpKiller.dll is not essential for the Windows OS and causes relatively few problems. PopUpKiller.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 126,976 bytes (94% of all occurrences) or 132,648 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 8A321C7D-9CED-45A8-870D-DAE843A45FD0 or 3EC8255F-E043-4cae-8B3B-B191550C2A22. The program is not visible. PopUpKiller.dll is able to monitor web browsers. The PopUpKiller.dll file is not a Windows system file. There is no detailed description of this service. There is no file information. PopUpKiller.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 68% dangerous, however you should also read the user reviews.

Recommended: Identify PopUpKiller.dll related errors

External information from Tony Klein:

Important: Some malware camouflages itself as PopUpKiller.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the PopUpKiller.dll process on your PC to see if it is a threat. If McAfee Popup Blocker 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.


User Comments

hab keine Ahnung wofür die gut ist aber scheint gegen PopUps zu helfen
  Big Smith privacy service is part of McAfee internet suite
Part of McAffee firewall and virus software
  RW   (further information)
Armor2Net firewall

Summary: Average user rating of PopUpKiller.dll: based on 5 votes with 4 user comments. 4 users think PopUpKiller.dll is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user is not sure about it.

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Best practices for resolving PopUpKiller issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active PopUpKiller process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the PopUpKiller.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

PopUpKiller.dll [all]