What is ycomp5_5_7_0.dll?

Ycomp5_5_7_0.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! Toolbar.

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Ycomp5_5_7_0.dll file information

The process known as Yahoo! Toolbar (version 5.5 for Internet Explorer) belongs to software Yahoo! Toolbar (version 5.5 for Internet Explorer) by Yahoo! (

Description: Ycomp5_5_7_0.dll is not essential for the Windows OS and causes relatively few problems. Ycomp5_5_7_0.dll is located in a subfolder of "C:\Program Files"—normally C:\Program Files\yahoo!\companion\installs\cpn\. Known file sizes on Windows 10/8/7/XP are 292,947 bytes (97% of all occurrences) or 298,168 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 02478D38-C3F9-4efb-9B51-7695ECA05670. The program is not visible. It is able to monitor web browsers. There is no detailed description of this service. The ycomp5_5_7_0.dll file is not a Windows system file. Ycomp5_5_7_0.dll is able to record keyboard and mouse inputs. Therefore the technical security rating is 65% dangerous; however you should also read the user reviews.

Uninstalling this variant: In case you experience problems using ycomp5_5_7_0.dll, you can remove the entire program Opera using Windows Control Panel.

Recommended: Identify ycomp5_5_7_0.dll related errors

External information from Tony Klein:

Important: Some malware camouflages itself as ycomp5_5_7_0.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the ycomp5_5_7_0.dll process on your PC to see if it is a threat. If Yahoo! 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

comcast yahoo update
Free Download offered with Adobe Reader 7.0
  Rich Roth   (further information)
Yahoo Toolbar - block popups, antispy, check yahoo mail.
  Dustin Goss   (further information)
yahoo browser add-on.
Yahoo toolbar... marked it as 2, not technically dangerous but does see all the websites you go to ;) - Came with Acrobat 7
  Stuart Harris  
Yahoo Toolbar; Helpfull in checking for popup's and has built in pop-up blocker. I use as secondary to stop pop-ups
  OlsonMD   (further information)
wants to return back to old homepage of yahoo
Its a handy tool for people who browse much of yahoo domain and use different features provided by yahoo!

Rating chart

Summary: Average user rating of ycomp5_5_7_0.dll: based on 11 votes with 8 user comments. 5 users think ycomp5_5_7_0.dll is essential for Windows or an installed application. 2 users think it's probably harmless. 3 users think it's neither essential nor dangerous. One user suspects danger. 3 users don't grade ycomp5_5_7_0.dll ("not sure about it").

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Best practices for resolving ycomp5_5_7_0 issues

The following programs have also been shown useful for a deeper analysis: ASecurity Task Manager examines the active ycomp5_5_7_0 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known Banti-malware tool tells you if the ycomp5_5_7_0.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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

ycomp5_5_7_0.dll [all]