The s4bar.dll file is a software component of My Search Bar for Internet Explorer and Netscape by My Search.
S4bar.dll is a DLL (Dynamic Link Library) file that has been reported as a low-risk PUP (potentially unwanted program). DLL files store data, code and resources needed by one or more programs in order to function correctly. This file is a Browser Helper Object (BHO) that adds functionality to Internet browsers. The file installs itself through third-party applications, usually without the permission of the user as a browser addon for Internet Explorer and redirects searches to affiliate websites. Removing this program is recommended.
s4bar stands for My Search Bar Dynamic Link Library
Most antivirus programs classify s4bar.dll as a harmful extension to Internet Explorer: e.g. Adware.Mysearch.G (detected by F-Secure), and Win32:Spyware-gen (detected by Avast). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated My Search Bar 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 My Search Bar and how to get rid of it.
Description: S4bar.dll is not essential for Windows and will often cause problems. S4bar.dll is located in a subfolder of "C:\Program Files" (mostly C:\Program Files\MySearch\bar\1.bin\).
Known file sizes on Windows 10/8/7/XP are 253,952 bytes (72% of all occurrences), 217,088 bytes or 229,376 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 014DA6C1-189F-421a-88CD-07CFE51CFF10. The program is not visible. The s4bar.dll file is able to monitor web browsers. It is not a Windows core file. S4bar.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 56% dangerous; however you should also read the user reviews.
Recommended: Identify s4bar.dll related errors
External information from Tony Klein:
Important: You should check the s4bar.dll process on your PC to see if it is a threat. If My Search Bar 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 ▾
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active s4bar process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the s4bar.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.