我這邊也有一篇 不過不是移除 是禁止他自動啟動
原來的網址我已經不記得了...sorry

Get rid of windows messenger

Start->Run->"gpedit.msc""
-Computer Configuration
-Administrative Templates
-Windows Components
-Windows Messenger

Here you can enable
"Do not allow Windows Messenger to be run"
and
"Do not automatically start Windows Messenger initially"