As I remember the unified key, but the problem is i search this forum and the whole youtube and evrything possibe to recover my partition .
This is exactly what happened:
I got a live Dvd to install the ubuntu, but before installation of ubuntu it asked whether you want to replace the windows 8, and i thought that it will delete the windows c folder and will replace the ubuntu latest 16 !!
Then i installed the ubuntu with warning that it will remove the windows and replace the ubuntu.
And after sucessful installation of ubuntu now i faced the really painful situation that i didn't have my partition of 1 terabyte. It has to be 2 partions on my windows.
After getting this problem i searched and researched the whole internet and i got nothing but somewhere it mentioned that use testdisk but the fact is i don't have any idea with the terminal window .
Since i seached officially the software database but there is so such software found. i downloaded it from the internet from their site but i don't know how to install a zip file even after extracting it.
But i got the Gparted and after opening it says like this:
I have many important things on my drive so I really need to recover it!