Dvd Studio pro hangs during startup

I am using DVD studio pro 3 . Everything was working for sometime and now when i launch Dvd sp it says missing software/hardware. and after that another error saying one button " i'am lucky " and the other button "Quit".
when i click on i am lucky it hangs there .
is there any body who has come across this problem.

machine config ,
G4 1.25 dual with 2GB Ram with DVD Studio Pro 3