What is s1940.dll?

S1940.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 s1940.dll.

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S1940.dll file information

The process contains no information about its author.

Description: S1940.dll is not essential for the Windows OS and causes relatively few problems. S1940.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 544,768 bytes (88% of all occurrences) or 348,160 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 D44BBB61-E17F-4AE6-A502-8D7E0B29E616. There is no information about the author of the file. The program is not visible. It is an unknown file in the Windows folder. S1940.dll is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. The s1940.dll file is not a Windows system file. S1940.dll is able to monitor applications. Therefore the technical security rating is 88% dangerous, however you should also read the user reviews.

Recommended: Identify s1940.dll related errors

External information from Tony Klein:

Important: Some malware camouflages itself as s1940.dll. Therefore, you should check the s1940.dll process on your PC to see if it is a threat. If s1940.dll 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

stumbleupon social bookmarking browser toolbar   (further information)
Apparently part of the Stumbleupon plugin.
  Dfaran   (further information)

Summary: Average user rating of s1940.dll: based on 2 votes with 2 user comments. One user thinks s1940.dll is essential for Windows or an installed application. One user thinks it's probably harmless.

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Best practices for resolving s1940 issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active s1940 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the s1940.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

s1940.dll [all]