Pour loader.exe, j ai eu le même problème.
ou en tout cas les mêmes symptômes.
=> la desinstallation de MessengerDiscovery (plug in WLM) ne fonctionne pas bien
et le message 'Loader.exe introuvable' est affiché lors du lancement de window live messenger.


pour résoudre le problème il faut finir manuellement la des installation de discovery:


Removing MDL folder and registry entries

* Remove MDL folder in "C:\Program Files\MessengerDiscovery\"

For removing registry entries we have two different way. Removing keys manual or running a file. If you don't know how to remove registry entries, you must use file. The file is below.

Removing registry keys with manual:

* Start > Run > type regedit
* Find these keys then delete (if they still there):

HKEY_LOCAL_MACHINE\SOFTWARE\iAvatars.com

HKEY_CURRENT_USER\Software\ecko_complex

HKEY_CURRENT_USER\Software\MessengerDiscovery

HKEY_CURRENT_USER\Software\MessengerDiscovery Live

HKEY_CURRENT_USER\Software\Matt Holwood

HKEY_LOCAL_MACHINE\SOFTWARE\Matt Holwood


*Also please check in your messenger folder, that you don't have the following files there left after uninstalling MDL:
(you have to allow to see hidden files under Tools - Folder Options to see those files)

Older MDL versions is winhttp.dll and version.dll

Latest build is winmm.dll