I have messenger live and messenger plus 4.0 and they both open fine but when I open a chatwindow you should be able 2 open the emotion sounds, format panel and the icon messengerplus! live but it doesn't open it makes a sound like a ding, but thaen I got some help from e few people and they told  me to go to:
' My Computer > Local Dick (C: ) > Program Files > MSN Messenger > and delete the file "riched20.dll" '

So I did that and it worked but when I turned off my computer and turned it on the next day it had the same problem again and again i did what you guys told me 2 do  but I can't keep doing this every time I want to chat, cause every time I turn my computer off and turn it back again it has the same problem again, so what should I do so it works for ever and I don't have 2 keep doing the same procedure every time??

Oh, now i know your problem...
Please uninstall smileycentral if you have it or wait a bit more, a new Plus! version is comming out..