Remove MSN Messenger from Outlook Express

Start/Run/Regedit

“HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Outlook Express”
Value Name: Hide Messenger, Data Type: REG_DWORD (DWORD Value), Value Data: (2 = remove messenger).
Create a new DWORD value, or modify the existing value, called 'Hide Messenger' and set the value to 2.