[ubuntu] Ubuntu not detecting windows drives

I have installed Ubuntu 16.04LTS on my laptop. While installing ubuntu, I did not selected dual partition and install Ubuntu as my primary OS. But now ubuntu is not detecting my windows 7(previous OS) drives. I tried to install again windows but its not detecting required partition.

I tried to resize/move ubuntu partition but it shows 0 free space. I caot resize/move it to create unallocated space.

Attaching Gparted screenshot of my system. Please help me in this regard as I am totally helpless and not able to access my rest of the windows drives.