The Dynamic-Link Library process file companioncore.dll (version 15.4.3538.513) is identified as Windows Live Messenger Companion Core or Windows Live Companion Core that is part of the software Windows Live Messenger Companion or Windows Live Messenger Core as developed by the company, Microsoft. This process file is furthermore considered to be as a Browser Helper Object or BHO, which is defined to be as an add-in for Windows Internet Explorer. The process file automatically executes once the Internet browser starts since BHOs are not halted by personal firewalls because they read them to be identified as the browser itself. The process file is found to be located in the subfolder C:\Program Files and the directory %PROGRAMFILE%\Windows Live\Companion. It has no visible window and is neither considered as a Windows system file, however, it is digitally signed by Microsoft Corporation which certificate has been issued by Microsoft Time-Stamping Service. It has a unique ID: 9FDDE16B-836F-4806-AB1F-1455CBEFF289 where the process file can be removed in the control panel. It has a file size on Windows 7/XP of 393,600 bytes (98% of all incidences), 387,952 bytes, 380,800 bytes or 299,880 bytes.

Most non-system processes that are running can be stopped because they are not involved in running your operating system. companioncore.dll. is used by Windows Live Messenger Companion Core, If you shut down companioncore.dll, it will likely start again at a later time either after you restart your computer or after an application start. To stop companioncore.dll, permanently you need to uninstall the application that runs this process which in this case is Windows Live Messenger Companion Core, from your system.

After uninstalling applications it is a good idea to scan you Windows registry for any left over traces of applications. Registry Reviver by ReviverSoft is a great tool for doing this.

The ReviverSoft experts have not yet reviewed companioncore.dll

A process usually a part of an installed application such as Windows Live Messenger Companion Core, or your operating system that is responsible for running in functions of that application. Some application require that they have processes running all the time so they can do things such as check for updates or notify you when you get an instant message. Some poorly written applications have many processes that run that may not be required and take up valuable processing power within your computer.

We have not received any complaint about this process having higher than normal impact on PC performance. If you have had bad experiences with it please let us know in a comment below and we will investigate it further.

The first thing you should do if companioncore.dll. is causing errors on your computer is to run a Windows registry scan with Registry Reviver If you are still seeing errors after this you should uninstall the program that companioncore.dll, belongs to, in this case Windows Live Messenger Companion Core