Windows msn help needed...

Sometimes I use msn messanger under windows xp (cause many friends use it), but I don't like Microsoft idea of running it each time you start windows or each time you start outlook express. The first, when windows start, is easy to solve removing the entry at the registry or using software like "XP antyspy", but when you run outlook express it installs onemore time the key registry and runs it. One solution maybe changing my mail client, other removing for ever msn, but Is there anything I can change to avoid outlook express reinstalling key registry and running msn each time I run it?
 
try this for 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"
 
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