How to remove the BellSouth Toolbar malware

The blstoolbar.dll file is a software component of AT&T Toolbar by AT&T.
Blstoolbar.dll is a DLL (Dynamic Link Library) file that belongs to the AT&T Toolbar, a web browser toolbar that modifies search results and home pages. DLL files store data, code and resources needed by one or more programs in order to function correctly. This is not an essential process for Windows and can be disabled if known to create problems. AT&T Pop-Up Catcher is a free utility tool designed to improve the overall internet surfing experience by automatically detecting and reducing online advertising. Pop-Up Catcher Manager provides options to enable or disable the service, set sounds for when a pop-up is found, set keyboard hotkeys to enable/disable a pop-up and whitelist sites to allow pop-up windows from. A slight reduction in overall system performance has been reported by several users using this program. AT&T Inc. is an American multinational telecommunications corporation, which was founded in 1983. It was formerly called the Southwestern Bell Corporation till 1995. It can indirectly trace its origin back to the original Bell Telephone Company founded by Alexander Graham Bell after he invented the telephone. Today, AT&T is headquartered at Whitacre Tower in Dallas, Texas. AT&T is the largest provider for cellular telephones in the United States.

BlSToolbar stands for BellSouth Toolbar

Some anti-malware programs classify blstoolbar.dll as a harmful extension to Internet Explorer: such as potentially unwanted program Generic PUP (detected by McAfee), and Adware.Generic.94769 (detected by BitDefender). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated BellSouth Toolbar software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about BellSouth Toolbar and how to get rid of it.

Click here to automatically remove the BellSouth Toolbar malware

Blstoolbar.dll file information

The process known as BellSouth Toolbar belongs to software BellSouth Toolbar or AT&T Toolbar by Bellsouth Telecommunications (

Description: Blstoolbar.dll is not essential for the Windows OS and causes relatively few problems. The file blstoolbar.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,369,088 bytes (73% of all occurrences), 1,854,064 bytes or 1,848,320 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 4E7BD74F-2B8D-469E-8CBD-FD60BB9AAE2E. There is no description of the program. The program has no visible window. The blstoolbar.dll file is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. It is not a Windows core file. Blstoolbar.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 69% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you still experience problems with blstoolbar.dll, you may also uninstall the software BellSouth Toolbar or AT&T Toolbar using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Recommended: Identify blstoolbar.dll related errors

Important: Some malware also uses the file name blstoolbar.dll, for example potentially unwanted program Generic PUP (detected by McAfee), and Adware.Generic.94769 (detected by BitDefender). Therefore, you should check the blstoolbar.dll process on your PC to see if it is a threat. If BellSouth 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

it is the toolbar provided by my isp
  l gourieux  

One user is not sure about it.

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Best practices for resolving blstoolbar issues

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

Other processes

blstoolbar.dll [all]