If you use Win 7, it will blocking you to input value into registry. Its depend on UAC setting. Maybe you can check it...

Go to this folder
(on Windows Vista or 7):
C:\Users\[your user name]\AppData\Roaming\Moi\
and delete any files there with a .key extension, like moi_v1_license.key

Thanks for l' input.
It works. good job.
Mario Raina