Shoutbox

The file that was detected is not a trojan but the program used to install/uninstall the sponsor. It can be extracted for two reasons only: the sponsor was accepted during the installation of Plus! Live or the sponsor was installed with a previous version of Messenger Plus! (3.xx) so the setup re-extracts the uninstaller to make sure it will be able to remove the sponsor when Messenger Plus! Live is uninstalled.

If you didn't accept to install the sponsor, then the only reason for this will be a previous installation from a previous version of Plus!. Of course, in that case, nothing is installed, the program is extracted only for future uninstallation. If the sponsor had already been removed by a third party program on your system, then don't worry about the uninstaller being deleted by your anti-virus, it probably won't be needed anymore (although it is never recommended to delete anything from yoru computer, sponsor or not, by using a third party program when an uninstaller is provided).