If that's your case, then consider downloading ZapMessenger, a super-simple application to uninstall Windows Live Messenger or MSN Messenger with a single click.
Using it is very simple: just press the Start button to begin uninstalling all the messengers on your system.
The program itself requires no installation. Just run it, even from a USB stick, and start uninstalling any messenger.
If you want to uninstall Windows Live Messenger – and do it fast – don't hesitate to download ZapMessenger.
Requires .NET Framework 2.0 or higher.