I had windows 7. I tried to dual boot it with kali linux 1.0.
However upon installation, i found that there was some unallocated space in hard disk so i installed it there. I dont know what happened to MBR.(I think i overwrite it.) . But when i rebooted i was unable to open windows.
There was no option for it in grub.
I tried everything from previous posts and even tried boot-repair bootable pendrive(it was showing : could not load kernel).Then i deleted that portion in which i installed kali linux from a live cd. But even now i couldnt open windows. All my data is stuck there. Please help me... What to do. Gpart is now showing only one partition i.e. ext. Is there any way i could get my windows back. I have spent two days looking for this problem but all in vain.

If you tried boot repair, it has an option to Create Bootinfo Summary. Run it again and post that output here. More information is needed before anyone can advise you.

I downloaded 64 bit iso image of boot repair from sourceforge.net .
I created bootable pen drive from first poweriso software but that didn't worked. Means whenever i booted from pen drive it was starting normal kali linux. Then i used unetbootin but when i ran that grub showed file not found and load kernel first. Thats all. There was no other iption other than normal grub commands.

Now there is only one thing coming up whenever i open computer, i.e. grub-rescue.

Get a EXT HDD and download a Linux liveCD if you don't have one already. Boot from it and transfer your data and files to the HDD.

Whm...
I have tried live cd of kali linux butit was not able to access data. All my files were not showing.
It was 923 gb as free space. Previously there was another partition of 9.** gb in which installed kali linux was there but i deleted that partition using live kali linux cd. Now there is only one partition which has all my data.I am sure i didn't formatted it. But now it cannot be opened by kali linux.


Info: I also used live windows usb and its repair kit, they were also not able to solve the problem. They could not recognise disk since linux may have changed it to another format

do you have a few YEARS of Debian experience
if the answer is less than 5 to 15 years

Kali is a very bad choice for a "new to linux " user

you will be spending ( a guess) the next 6 months to a year learning just the basics OF KALI!

and that is BEFORE you can try to recover the files on the windows install using Kali

Kali is not a normal linux distro
thinking that kali is a normal every day distro is like calling a Formula ONE race car a family car .

HOW did you resize the windows partition ?
7 normally came preinstalled WITH A HIDDEN "recovery" partition on the very first partition
--- this causes very annoying problems with installing ANY second OS ( even win XP )

just a guess here
that was the Microsoft RECOVERY!!!!! partition on the first partition ( also has the MBR of win7)

as above Kali is not a normal OS

and i am guessing you overwrote the Microsoft bootloader ( chainloading to it in GRUB is not not a option )


you are up "bleeps" creek ....

but maybe not all is lost ( unless you messed up other things also )

go to the MICROSOFT !!! web site and read the instructions for using that
WINROWS7 "recovery disk" you were INSTRUCTED TO MAKE!@!!!!!!!!
the VERY FIRST TIME you booted win7

--- you DID make that required recovery disk ? right ?

--- you NEED IT NOW

https://support.microsoft.com/en-us/kb/927392

run the Microsoft tool "Bootrec.exe" from the recovery disk you made

Yep.... You are right. I have just one year experience of kali and that alyearin virtual machine. I think you are right that i overwriiten microsoft bootloader. But i already checked Windows repair cd. There was nothing it could do. Now i think i have to format hard disk. There is no other option left.