So I am assuming you want to install Ubuntu onto the 655GB partition?
It doesn't quite look like Ubuntu is installed correctly, the 655GB partition would be EXT3 if Ubuntu is installed. NTFS format cannot handle the file permissions required by Linux.
I would delete the 655GB, 9GB and 8MB partitions and leave them unallocated in easeus. Then I would install Ubuntu, selecting the 655 GB partition. Once the computer reboots, it should reboot of the grub loader and you should be able to select win 7 or Ubuntu.