Try and upgrade to Windows Messenger 5.1...
http://download.microsoft.com/download/e/b/3/eb3b...f407/messenger.msi
And as Madman said, Windows Messenger and MSN Messenger are both designed to work with XP perfectly...Where you may have got this strange theory is because Windows Messenger is installed with XP and the only reason Windows Messenger is installed on XP when installed is because it is needed to work some features of Windows XP (like remote assistance)...