84,488,480 programs installed

Should I remove Windows Live Messenger Companion Core?

What percent of users and experts removed it?
7% remove it93% keep it
Overall Sentiment
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How common is it?
Reach 0.0009%


15.4.3502.0922 100.00%

Other programs by Microsoft

Windows Live Messenger Companion Core

What is Windows Live Messenger Companion Core?

Windows Live Messenger Companion was an add-in for Windows Internet Explorer that detects when a user is on a website that one of their friends has shared content from and surfaces that update so that the user can instantly view what their friends have shared and leave a comment to the shared content on Windows Live. The service utilizes Windows Live ID and integrates tightly with Windows Live Messenger to obtain the user's contact list and their shared contents. Sharing links to webpages with the user's friends on Windows Live within the web browser.


It adds a Browser Helper Object (BHO) to Internet Explorer. The setup package generally installs about 6 files and is usually about 3.29 MB (3,454,976 bytes).

Program detailsProgram details

URL: windows.microsoft.com/en-us/windows-live/essentials
Installation folder: C:\Program Files\windows live\companion
Uninstaller: MsiExec.exe /I{78A96B4C-A643-4D0F-98C2-A8E16A6669F9}
(The Windows Installer is used for the installation, maintenance, and removal.)
Estimated size: 3.29 MB

Program filesFiles installed by Windows Live Messenger Companion Core

  • companioncore.dll - Windows Live Messenger Companion (Windows Live Messenger Companion Core)
  • companionhi.dll - Windows Live Messenger Companion high contrast resources
  • companionres.dll - Windows Live Messenger Companion core resources
  • companionuser.exe - Windows Live Messenger Companion User Elevation Helper
  • companionlang.dll
  • sqmapi.dll - SQM Client

Program behaviorsBehaviors exhibited

Internet Explorer BHO
  • companioncore.dll is installed in Internet Explorer as a BHO (Browser Helper Object) under the name 'Windows Live Messenger Companion Helper' with the class of {9FDDE16B-836F-4806-AB1F-1455CBEFF289}.
Internet Explorer Extension
  • companioncore.dll is installed as an Internet Explorer extension using the class {0000036B-C524-4050-81A0-243669A86B9F}.

How do I remove Windows Live Messenger Companion Core?

Quickly and completely remove Windows Live Messenger Companion Core from your computer by downloading Reason's ‘Should I Remove It?’ (click the button below).
Or, you can uninstall Windows Live Messenger Companion Core from your computer by using the Add/Remove Program feature in the Window's Control Panel.
  1. On the Start menu (for Windows 8, right-click the screen's bottom-left corner), click Control Panel, and then, under Programs, do one of the following:
    • Windows Vista/7/8: Click Uninstall a Program.
    • Windows XP: Click Add or Remove Programs.
  2. When you find the program Windows Live Messenger Companion Core, click it, and then do one of the following:
    • Windows Vista/7/8: Click Uninstall.
    • Windows XP: Click the Remove or Change/Remove tab (to the right of the program).
  3. Follow the prompts. A progress bar shows you how long it will take to remove Windows Live Messenger Companion Core.

How do I reset my web browser?

If your web browser homepage and search settings have been modfied by Windows Live Messenger Companion Core you can restore them to their previous default settings.
Microsoft Internet Explorer
Mozilla Firefox
Google Chrome

Win 7 (SP1) 85%
Win Vista (SP2) 15%
Uninstall it 7%
Keep it 93%
United States

Windows OS versionsWindows

Which Windows OS versions does it run on?
Windows 7 84.62%
Windows Vista 15.38%

Distribution by countryGeography

71.43% of installs come from the United States
Which countries install it?
  United States 71.43%
  Taiwan 28.57%

OEM distributionPC manufacturers

What PC manufacturers (OEMs) have it installed?
Toshiba 25.00%
ASUS 25.00%
Acer 25.00%
Hewlett-Packard 16.67%
Sony 8.33%

About Microsoft

Microsoft Corporation develops, manufactures, licenses and supports a variety of products and services related to computing.
Publisher URL: www.microsoft.com


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