Changing a message that appears in a window, while installing an executable file.

I have a software that is install great, who autorize great, but at a time, it display ... "the software can not be registred press ok to continue". This is just a visual problem, but I want to transform that issue in a pleasure :))) I want to display "The software was Succesfuly Registred" (point 17 in instalation steps), please press ok to continue. So I need a little design transformation in the exe file. Thanks! The project must be done in max 12 hours. All you need is in atash ... please follow the download link! Download link [login to view URL]