Cubase le 7 Reactivate problem

I would like to activate my cubase le 7 again which is came along with my soundcard . I used it for a while but after i formatted the pc i couldn’t activate it again. i try to activate it again(reactivate) but in the system i couldn’t see cubase le 7 , 5 and 6 is available could you please help me with this situation?
(I read the FAQ)