Want to discontinue win7 and keep ubuntu

Hi all,

I want to discontinue win7 on my laptop but keep my ubuntu 12.04 lts install.

Problem is...
I installed ubuntu in windows???
Looking at gparted I only have a NTFS partition and no ext3 partition?

Not sure how to post a picture showing gparted, the insert image button brings a a url ?

Here is a link to the picture:
https://drive.google.com/file/d/0B94...it?usp=sharing


Not sure if it is even possible to do what I want to do.....
Don't really want to lose my ubuntu install because everything works!

Thank you in advance for any help