Apple Logic Pro /LogicExpress Discussion

he strangest thing happened...I tried to open my Logic Pro 7 program on my
Powerbook G4 1.6 ghz, and received a message saying:  "Welcome to Logic!  Do you want to 
run the demo before purchasing?"  If I clicked "quit" the program quit, and if I clicked,
"yes" it said, "Sorry, there is no demo for Logic Pro 7" and quit itself.  I've tried restarting and
reinstalling the whole program, but nothing seems to work.  Is my XS Key broken?  Does 
anyonehave any suggestions?  I've been using Logic for years, and have never before 
encountered this problem.

Thanks,

Justin