What is PCTBrowserDefender.dll?

The genuine PCTBrowserDefender.dll file is a software component of Threat Expert Ltd. Browser Defender by Threat Expert Ltd..
"PCTBrowserDefender.dll" is a Windows dynamic link library file that is installed with Browser Defender and Browser Guard by Threat Expert. The file is an Internet Explorer add-on/browser helper object that displays in search engines whether a website is safe or dangerous. As you open a search engine in Internet Explorer, this browser helper object shows each listed search entry as safe or risky. The file is included with the PC Tools Internet Security suite. Threat Expert is actually the name of the software that includes this dll file, but it is listed with a company name of Threat Expert Ltd. However, the software is registered through Verisign by PC Tools.

PCTBrowserDefender stands for PC Tools Browser Defender Toolbar

PCTBrowserDefender.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 Browser Defender Toolbar.

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

PCTBrowserDefender.dll file information

The process known as Browser Defender Toolbar belongs to software Threat Expert Ltd. Browser Defender or Browser Defender or Browser Guard by Threat Expert (

Description: PCTBrowserDefender.dll is not essential for the Windows OS and causes relatively few problems. PCTBrowserDefender.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 567,248 bytes (35% of all occurrences), 395,216 bytes and 9 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 2A0F3D1B-0909-4FF4-B272-609CCE6054E7. The program has no visible window. The PCTBrowserDefender.dll file is a Verisign signed file. PCTBrowserDefender.dll is able to change the behavior of, or monitor Internet Explorer. PCTBrowserDefender.dll is certified by a trustworthy company. The PCTBrowserDefender.dll file is not a Windows core file. PCTBrowserDefender.dll is able to record keyboard and mouse inputs and connect to the Internet. Therefore the technical security rating is 36% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to do the following:
  • contact [1][2] to assist you
  • update [1][2] the program to the latest version
  • uninstall Browser Defender or Browser Guard software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7)

Recommended: Identify PCTBrowserDefender.dll related errors

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

Comes with spyware Doctor
  Chuck Bridges  

Summary: Average user rating of PCTBrowserDefender.dll: based on 1 vote with 1 user comment. One user thinks PCTBrowserDefender.dll is essential for Windows or an installed application. One user is not sure about it.

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Best practices for resolving PCTBrowserDefender issues

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

PCTBrowserDefender.dll [all]