I have installed Msg+, and it works fine, but everytime I reboot, I can't see the icon in the menu. The program though is still there. In the helpdesk of Msg+ they say this:
"This can be your Anti-Virus, your display drivers or any other software monitoring your actions. Messenger Plus! has a built-in protection to help fix this problem: if the Plus! menu isn't displayed in Messenger, a special window will show-up that will help you fix the problem."

Well that window does not appear!
Anyone a suggestion, don't want to reinstall Msg+ everytime I reboot.

OK, it hasn't loaded or it hasn't hooked.
Try going to Plus! --> Preferences --> Miscellaneous and tick "Force Messenger Plus! to load when messenger starts".