Shoutbox

I guess you already tried this:
- Reinstall MsgPlus with the sponsor and restart.
- Make sure Messenger and Internet Explorer are not running and close any other unnecessary program (including antispyware and antivirus programs).
- Uninstall MsgPlus.

Check this step by step tutorial.

If that still doesn't work, there's an uninstaller, but use it only if the above doesn't work. Make sure you're doing everything as described.