What is StumbleUponIEBar.dll?

StumbleUponIEBar.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 StumbleUpon Toolbar.

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StumbleUponIEBar.dll file information

The process known as StumbleUpon Toolbar belongs to software StumbleUpon IE Toolbar by (

Description: StumbleUponIEBar.dll is not essential for the Windows OS and causes relatively few problems. The file StumbleUponIEBar.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 987,832 bytes (71% of all occurrences), 966,656 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 145B29F4-A56B-4b90-BBAC-45784EBEBBB7. The program has no visible window. The StumbleUponIEBar.dll file is able to monitor web browsers. It is not a Windows core file. There is no detailed description of this service. The file is digitally signed. Therefore the technical security rating is 59% dangerous; however you should also read the user reviews.

Uninstalling this variant: The software publisher Stumbleupon provides an uninstall program (Control Panel->Software->StumbleUpon IE Toolbar).

Recommended: Identify StumbleUponIEBar.dll related errors

Important: Some malware camouflages itself as StumbleUponIEBar.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the StumbleUponIEBar.dll process on your PC to see if it is a threat. If StumbleUpon 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 belongs to the "stumble upon" browser extention
Part of the Stumbleupon BHO
  John   (further information)
Part of Stumble Upon Browser extension
Randomly selects websites for viewing. Can sometimes result in unwanted spyware being placed on computer
  John Mason  
God this takes forever to load, it's just a component of the StumbleUpon web browsing software/webpage.
  JV   (further information)

Rating chart

Summary: Average user rating of StumbleUponIEBar.dll: based on 6 votes with 5 user comments. 3 users think StumbleUponIEBar.dll is essential for Windows or an installed application. 2 users think it's neither essential nor dangerous. One user suspects danger.

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Best practices for resolving StumbleUponIEBar issues

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

StumbleUponIEBar.dll [all]