I tried to install MsgPlus! quite some time ago, and half-way through the installation process I decided to click cancel. Afterwards, a pop-up came up that said "Messenger Plus! has not been installed on this system properly. Please do so..etc" Now this error message pops up every single time when I open my computer. I tried installing MsgPlus! and then uninstalling it, but the error message still continued to show up every time I log onto the computer.It is very annoying and I would really appreciate if someone could tell me how to get rid of it.

Is it in add/remove programs?

No it doesn't seem to be. It was once I installed it again properly, then I removed it from add/remove programs but the pop still remained.