If you haven't deleted your partition and have not installed new windows then try this to get rid of boot fix problems:
1.Boot windows from DVD or flash drive make sure you are booting the same window version and same architecture like if installed version is windows 8 64bit then flash or DVD must have the same.
2.Go windows install menu but do not click on install now but click repair computer and then go to Troubleshoot option and advance option and then command prompt.
3.On command prompt type bootrec.exe /FixMbr and press enter .
4.Then Type bootrec.exe /FixBoot and press enter.
5.Exit the command prompt and reboot computer.
If it recovers the windows boot then fine. If not follow the below process:
1.Type diskpart and press enter.
2.Type listdisk and press enter.
3.Type select disk <disk number 0 ,1 ,2 ..> (the partition number where windows is installed)
4.Type list partition and press enter.
5.Type select partition <partition number 0,1,2...> . (the partition number where windows is installed)
6.Type active and press enter.
Close the command prompt and raboot the windows it will bring the winsows up.
Now the next question: You can get your data for that you have to do following:
- Download any Linux live CD(preferably Ubuntu 14.04).
- Burn it on DVD or usb flash drive.
- Boot from DVD or flash drive.
- After booting click on Try without installing.
You will get the Ubuntu desktop with your windows partition mounted. Double click on Drive icon in menu and see your content there. If not mounted then mount using mount command.