What is yiesrvc.dll?

Yiesrvc.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 Yahoo! IE Services.

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Yiesrvc.dll file information

The process known as Yahoo! IE Services

belongs to software Yahoo! Toolbar or Yahoo! Browser Services or AT&T Yahoo! Applications or BT Yahoo! Applications or IE Services or Yahoo! Anti-Spy or Verizon Yahoo! Applications or Rogers Yahoo! Applications or Norton Spyware Scan provided or Yahoo! extras or SBC Yahoo! Applications or Yahoo! IE Services or SBC Yahoo! DSL Activation or Sony on Yahoo! Essentials or Yahoo! Central or SBC Yahoo! DSL Utilities

by Yahoo! (

Description: Yiesrvc.dll is not essential for Windows and will often cause problems. Yiesrvc.dll is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 198,136 bytes (57% of all occurrences), 222,448 bytes, 181,752 bytes, 181,352 bytes or 185,848 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 5BAB4B5B-68BC-4B02-94D6-2FC0DE4A7897. The program has no visible window. Yiesrvc.dll is a Verisign signed file. The file is able to monitor web browsers. The service has no detailed description. It is not a Windows core file. The yiesrvc.dll file is digitally signed. Yiesrvc.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 47% dangerous, however you should also read the user reviews.

Uninstalling this variant: You may also uninstall the software Yahoo! Messenger or Yahoo! IE Services using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program), visit the support page [1][2] or update [1][2] to a possibly bug-fixed version.

Recommended: Identify yiesrvc.dll related errors

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

Caused IE 7 to crash on exit when multiple tabs were open
Is part of a problem that has blocked the ability certain Windows Updates since September 2007. Removed the add-on, but damage was already done. A virus or trojan piggybacked off of it and it damage my win32 files. Even after removal, if you use IE it keeps returning. Had to switch my internet route and will have to fully restore my computer in order to receive crucial updates.
  Carol F  
Crashes IE when using Vista
IE crashes continuously. I switched to Firefox and don't have the problem. Removal shows no errors in the system.
resets browser to home page and continously opens up new browser windows
It is included with the Yahoo Messenger. Since its corporations being able to access your comp, I wouldnt trust it. Caused IE (version 6to crash.
I seem to not have the problem with the error if I am using the browser set up by my ISP. Every time I use IE though it has a problem
I know the fix! Do a file search for "yiesrvc.dll" on your hard drive. when found, hilite it and delete it. Restart computer. Then uninstall Yahoo BROWSER and do not reinstall until Yahoo fixes problem. This is spyware disguised as adware attaching itself during the Yahoo Browser install online.
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of yiesrvc.dll: based on 28 votes with 9 reviews. 9 users think yiesrvc.dll is essential for Windows or an installed application. 2 users think it's probably harmless. 4 users think it's neither essential nor dangerous. 4 users suspect danger. 9 users think yiesrvc.dll is dangerous and recommend removing it. 7 users don't grade yiesrvc.dll ("not sure about it").

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Best practices for resolving yiesrvc issues

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

yiesrvc.dll [all]