First of all,to inform you, this has happened due to my mistake!
and i am really very guilty about it.
The thing is that i have both ubuntu 12.04 and win 7 home basic installed on my system.
I installed ubuntu later so as expected the Windows 7 loader was replaced by the grub loader.
What i wanted to do was restore my original Windows 7 loader so that i could set my default OS to Windows 7 so that i didn't have to select it every time my system booted up.
In this regard,i searched some youtube videos and then ended up with a video which was not described very well, still i followed it because i wanted to get back the Windows 7 loader desperately.
I am providing the link to that video: Restoring Windows's Bootloader After Installing Linux - YouTube
I went ahead with the steps described in the video, And then shit happened. My windows partition got corrupted and now i stand at the risk of losing about 500gb of important data which i had collected in about over an year.
I am able to boot using ubuntu but i am unable to browse my files on the hard disk(which i could do easily, earlier) as it doesn't show any partition.
When i inserted the recovery disc,it simply gives the option of restoring the factory settings,nothing else(like repair,which it used to give earlier).
My question to you sir, is that, is there any way through which i can restore my computer to normal and save my data? I will be really very very grateful to anyone who helps me out of this problem as the data which i am about to lose is very personal and precious to me.