Ophcrack: how to back up from drive C(sda2) to drive D(sda3) of a windows 7 machine not booting?

Ophcrack: how to back up from drive C(sda2) to drive D(sda3) of a windows
7 machine not booting?

My laptop cant boot. So im about to reformat it, I backed up my documents
using live CD Ophcrack, to drive D (sda3). At first I can copy paste my
files. But not until im about done, at 75% a weird dialog box appears with
a title "error" but a content "success". Really weird, and after that, I
can then no longer see the contents of my sda3, and also the partially
copied files there.
I'm new to linux or isolinux, so what would you suggest?
1.) maybe I can do some terminal command to enable writing permission in
sda3?, how about its content that's not visible anymore? or is my drive
D(sda3) gone already? hence, I just want to backup a folder I placed in my
desktop (which is surely in C), so I should paste it to drive D(sda3)
before I format Drive C.
2.) or the lesser convenient way to address this is that I need to get
some hardware to connect my laptop hdd to a desktop and do the backup etc,
as what I have researched.
3.) or maybe there's another software that might do the job better?
P.S: the preferred option is #1. But how? what command?