Please any body say How to install windows 7 on ubuntu 14.04 dual boot would be a Big help if explained in Step by step !!
Try Step-by-step setup instructions for Window/Ubuntu dual-boot from the Ubuntu documentation, scroll about half-way down for Windows installation on current Ubuntu set-up.
If you have enough time see also this tutorial: Dual Boot Windows 7 and Ubuntu 12.04. I used this tutorial to install Ubuntu 14.04 alongside Windows 7 and it worked :)
However my partion table look a bit different. If it'll help you I put the screenshot of it below: