Shoutbox

Try this:

1. Go to C:\Program Files , find the Messenger Plus! Live folder, right-click it, and select Propierties.
2. Go to the Security tab, click "Edit" (and accept it when UAC prompts you to), and allow "Complete Control" to your user and the admin user (starting with Vista, you don't own an Admin account, only Admin privileges, basically the same as Linuxes and Macs). Just apply and see if it works =)