What is the exact error message? A popup window just saying NO? Windows comes with Windows Messenger while MSN comes with MSN Messenger. They're essentially the same thing except that MSN Messenger integrates a bit better with MSN Explorer.
To permanently disable Windows Messenger from your computer, and solely use MSN Messenger, you can use one of those programs in the Administration Tools in the control panel. Unfortunately I don't remember which one it is right now or where ... and I'm sorta busy

Do a search for it, I'm sure it will turn up.
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