filesystem - NTFS partitions hidden under EXT4 file system / partition...want to recover files from NTFS

I am new to ubuntu, but very impressed with the system.
so one day i tried installing ubuntu 10.10 along with windows in dual boot first place it didnt get installed properly and during second attempt i could do it right but oh...i lost my windows 7 ,

here is my problem and what i have done till now.

1. i have hdd installed with ubuntu same disk have windows partitions and i need to extract data from those ...very very important


2. i tried to access the same from ubuntu ...can not access it,
   3.reinstalled the windows 7 , hdd is not detected
   4.during installation ubuntu gone , so reintalled



3. scan in ubuntu says hdd is fine and DiskInternals linux reader actual show the NTFS partitions , recovery tool not able to get any data out.

   
   

   , please help i need data from these partitions...please

I feel that i have put ext4 partition on ntfs filesystem...and now not able to access it