Initially I had dual boot machine (Windows Vista and Windows 7), and I tried to install ubuntu 14.04 by replacing windows 7. While installing it prompted me if I need to install along with windows 7 or delete windows 7 and install ubuntu. I selected second option and proceed. After successful installation of ubuntu, it is showing entire hard disk as a single partition and the memory stats as "3.2 GB used 245 GB free" (my hard disk is of 250 GB), I got shocked. How can I recover the important data which I have in D,E,F,G drives of my hard disk?