Recover Windows 7 Data

Recover Windows 7 Data

I am completely new to Ubuntu. I have a Dell Studio 1555 laptop. I had
Windows 7 Ultimate (64-bit) installed onto it and it was the only OS. In
Windows, my 250-GB hard disk was partitioned only into drive C (where
Windows was installed) and drive D.
Recently, I installed Ubuntu 13.04 via a pen drive; I performed a clean
install. My aim was to be able to use Windows 7 and Ubuntu 13.04 both as
and when required wherein I expected to get a screen that asks me to
choose between the two when I boot the laptop. I had done the same on my
desktop and it worked fine.
However, on my laptop, when I choose Windows 7 at the screen where I am
supposed to choose between Ubuntu 13.04 and Windows 7, it doesn't boot up,
saying "Windows 7 cannot start because of some recent software or hardware
changes". They ask me to use the Windows installation disc and repair my
computer. When I did that (using the installing Windows through USB
method), there was no option to "repair your computer", which I think
indicates that it doesn't detect the already installed Windows.
I don't remember what exactly is it that I did wrong while installing
Ubuntu but I remember NOT selecting "overwrite" or "erase disk", because I
wanted my Windows data to remain intact. Also, I think I must have
installed Ubuntu in the same drive as Windows (drive C) and that my
"home", "root", "bin", "boot" are in the same drive because in Ubuntu the
only device I see under "Devices" is "Computer" with all the
aforementioned folders.
Ubuntu works just fine. However, I can't find my Windows data anywhere!
Almost all the data was in drive D with only programs installed in C. I
don't mind losing the application programs but my drive D contained some
very important data.
I searched the forums for a solution but for fear of making the problem
completely irrepairable, I didn't try most of the stuff. I just need to
access the data so that I can copy it onto my desktop and perform clean
installations of Ubuntu and Windows 7 again.
I don't know if this will help: paste.ubuntu.com/5794687
Thank you!