How to dual boot Ubuntu with Windows 7

Hi,
This is my little problem: I want to install Ubuntu in a dual boot with W7. I had a partition, not formatted to 25 GB. I had booked for Linux.
I wanted to have a greater capacity, so I reduced the score of Seven, which has to create a new non-formatted too, 50 GB, and I would therefore be 25+50 for Ubuntu.
I have found a software, which normally allows, Easeus, but can not find where?
Gparted not want, because I read that, it is a hassle to use. Am I wrong?
I would like to know other options.
Thanks.
