First of all Windows Messenger is build in into Windows XP. This doesn't mean it is the preferred chat client. Most users prefer MSN Messenger.
Then, some points to know...
You don't
have to use Windows Messenger if you like MSN Messenger more.
Windows Messenger needs to start up
before MSN Messenger if you want to use both at the same time with Plus!
This is proberly your problem, by updating MSN Messenger it puts itself into the startup folder and now starts before Windows Messenger and thus will give errors because Windows Messenger is also started, even if you don't know it...
What Fukafly meant was: break the link between Windows XP and Windows Messenger, so that Windows Messenger wont startup any more without you knowing it (believe me it does that) and you wont have problems with it anymore.
To do that you need to
hide Windows Messenger. Follow the instructions given here
http://shoutbox.menthix.net/showthread.php?tid=21...d=201175#pid201175 to do just that.
After you've done that, you can choose yourself what program you use: Windows Messenger or MSN Messenger. Furthermore, all function in MSN Messenger will keep working (MSN Messenger uses some functions from Windows Messenger).
But do remember that whenever you use both programs at the same time, you need to startup Windows Messenger
first.