I wanted to dual boot my Windows 7 (x64) with Ubuntu 13.10 (x64). When I get to the stage when I select a partition, it says that Ubuntu does not detect any other operating system in my computer. I chose 'Something else' and the only partition that came up was 'free space' with 500 GB free space (my hard drive space). I set two partitions before installing Ubuntu. 414 GB for Windows 7 and 50 GB for Ubuntu. My disk is not Dynamic.
From the screenshot,it was clearly shown that you accidentally deleted the previously installed Windows partition.
So exit the ubuntu installer and create new partitions for windows and Ubuntu using Gparted Partition Editor.
After that run the ubuntu installer then choose "something else" option and select the created ext4 partition for installing Ubuntu.And don't forget to create a swap partition of size which was double the RAM size(applicable for 1 or 2 GB RAM).
If you need to recover data from that disk try to do so BEFORE INSTALLING ANOTHER OS. There are tons of disk recovery tools out there, just an fyi. The files are probably still there, just the filesystem information was erased.