The installation was made without any problems, but the Plus menu only shows the option "Messenger Plus Inactive", wich, when clicked, shows the message box: "An error occurred that prevent Messenger Plus Live from work correctly. Try reinstalling this software or wait a update is available." But this procedure not worked.
My version of Vista is Ultimate 32 bits.
My version of Live Messenger is 8.5.1302.1018
My version of Plus is the last one.
My processor is a Intel Core 2 Duo 4500 / 2 GB RAM
Are you really sure that you have the latest Plus! Live?
At this time, the latest version is 4.60.326. Make sure that you downloaded the setup from the official download page, that way you'll always have the correct version of Plus! Live.