What is StumbleUpon.dll?

StumbleUpon.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.

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StumbleUpon.dll file information

The process known as StumbleUpon belongs to software StumbleUpon by StumbleUpon.

Description: StumbleUpon.dll is not essential for Windows and will often cause problems. The StumbleUpon.dll file is located in a subfolder of the user's profile folder or sometimes in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 269,824 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 DB616CFF-D989-48A8-9C85-E2A8D56AB2CA. There is no file information. The program is not visible. The StumbleUpon.dll file is able to monitor web browsers. StumbleUpon.dll is not a Windows system file. Therefore the technical security rating is 58% dangerous; however you should also read the user reviews.

Recommended: Identify StumbleUpon.dll related errors

Important: Some malware camouflages itself as StumbleUpon.dll. Therefore, you should check the StumbleUpon.dll process on your PC to see if it is a threat. If StumbleUpon 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's not Spyware!
  Ryan Jackson  
This is the StumbleUpon toolbar. It is not spyware.
  Geoff   (further information)
Try to uninstall stumbleapon toolbar and you will realize that it is mall-ware. not in add or remove programs list. sucessfully removed extension from fire fox, then stumbleapon toolbar attached itself to my google chrome . no uninstaller available. bad bad do not use. anything this difficult to remove is bad.

Summary: Average user rating of StumbleUpon.dll: based on 5 votes with 3 user comments. 2 users think StumbleUpon.dll is essential for Windows or an installed application. 3 users think StumbleUpon.dll is dangerous and recommend removing it.

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Best practices for resolving StumbleUpon issues

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

StumbleUpon.dll [all]