Windows Messanger in Windows XP *IS* MSN Messanger. It's just been integrated into the desktop now. It's really hard to get rid of. You can upgrade to a newer version of MSN Messanger if you want, but you can't get rid of it completely
More precisely, MSN Messenger and Windows Messenger are two entirely different clients. Also, Windows Messenger isn't integrated into the desktop, it's simply a core component, like NetMeeting...so it cannot be uninstalled via Add/Remove. However, MSN Messenger v5.0 can easily be uninstalled via Add/Remove on XP.
Further, Windows Messenger is (currently) exclusive to XP, and cannot be installed on downlevel operating systems. Up until last month, MSN Messenger could only be installed on downlevel, and could not be installed on XP.
Today, with v5.0 of MSN Messenger, you can install it side-by-side with Windows Messenger on XP, and run both clients simultaneously, logged into two seperate hotmail/msn/passport accounts.
When installing v5.0 on XP, it tries to "be smart". However, for best results, you should have SP1 and the latest build of Windows Messenger installed
before installing MSN Messenger v5.0. If you installed v5.0, and you'd rather go back to using v4.7, it's simply a matter of launching both clients, go Tools->Options->General and change your sign in options for each, or uninstalling MSN Messenger via Add/Remove.
Outlook and OE are both hardcoded into using v4.x versions of both MSN and Windows Messenger. As a result, Windows Messenger will still autolaunch. To disable for Outlook, go Tools->Options->Other and uncheck "Enable Instant Messaging".
Hacking Windows Messenger off your hard drive can sometimes cause Hotmail to take forever to load in OE. If v4.7 still auto-launches and auto-logs on along with OE...thus kicking off your v5.0 logon...you can prevent auto-logon via Tools->Options->General and unchecking "Automatically logon to Windows Messenger". This won't prevent OE from auto-launching the client, tho.
If you like Messenger integration with your Hotmail account via IE, then you will need to use v5.0. Hotmail no longer supports v4.x versions of either MSN Messenger or Windows Messeneger for integration.
When I log onto MSN (via the manual dial-up) I can't get Windows Messenger to fully sign in--it just perpetually displays says "signing in..." I have to manually cancel the sign-in attempt then click "Sign In" and it connects.
This is odd. However, I'm assuming you got an MSN8 account, so there may be an explanation: MSN8 ties directly into MSN Messenger. For example, if you launch MSN8 browser and logon, then launch Windows Messenger, you will never be able to logon Windows Messenger at all, regardless of which account you use (on the flip side, if you logon Windows Messenger before launching MSN8, you can simultaneously use both Messenger clients). This may be why WinMsgr fails on the first logon attempt via DUN: there could be something specific to the MSN8 shell that still loads, even tho' you're configured for DUN. An option is to switch to MSN Messenger.