What can be this problem?

[Sumeeth6666]

either someone hacked it
or
there is something set up in the script to delete users after a certain event
or
server error

either way if you haven't made a backup then you have lost all

do you know any secure ad network script ?

[something else]

either someone hacked it
or
there is something set up in the script to delete users after a certain event
or
server error

either way if you haven't made a backup then you have lost all

[Sumeeth6666]

I downloaded cyberlink script.and used on my site.but after some users registered the sites database was edited and all users were deleted automatically...what is the problem ?