For future reference use the
button to edit your posts instead of making multiple ones in a row it is against the forum rules.
Now try this:
Start > (Settings) Control Panel > Double Click Internet Options > Advanced Tab > Put a checkmark beside Disable Script Debugging > Apply > Ok.
Now try and use MSN Messenger
Now you said you reinstalled MSN Messenger? It seems that it might be a problem with the feature where it gets the Windows Media Player song title. I suggest completly uninstalling MSN Messenger, restarting and redownloading/installing the latest version.