OK,finally after a few days got my activation back again ( key-reset??).
I would say;do not give up,support will help you,need some patience!
Still dont know how many times you are allowed to reinstall,without losing activation!!
Very strange,no activation after a few reinstallings possible,bought CD-key and on your own machine,frustrating and wrong, because its your own bought (expensive!!) software!
Still no answer from support about this question.
Do NOT GIVE UP!! CyberLink updates PDVD12 next month for solving these frustrating problem!!