Dual boot Linux Installation went wrong!!!

Hello, folks!

I installed Ubuntu Studio in my laptop, which is already is having a Win7 OS, My aim was to make it a dual boot ,.. but during installation i got messed up with the partition system.. and dnt know what I did , which finally ended as this...!!

ab@ubuntu:~$ sudo parted -l

Number Start End Size Type File system Flags
1 1049kB 496GB 496GB primary ext4 boot
2 496GB 500GB 4257MB extended
5 496GB 500GB 4257MB logical


Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/cryptswap1: 4257MB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 4257MB 4257MB linux-swap(v1)

Please, needed help to recover all my lost data of my hard drive of WIn7