Shoutbox

It is NOT a trojan, your adware removal software detects it wrong. If you then delete that it will corrupt the uninstaller. You are at no risk at all, nothing malicious is in the sponsor, it is simply a program that displays advertisement popups when Internet Explorer is running, this is so Patchou(creator of Messenger Plus!) can generate revenue. This is not the reason you couldn't uninstall it before though, something else has happened, I'm not sure what.

It should fix itself if you reinstall Plus! with the sponsor, restart, then uninstall both plus and the sponsor. (You can then install Plus! without the sponsor)