How To Solve Grub Rescue Error In Windows 7/8/XP/8.1

Fixing GRUB error: unknown filesystem, grub rescue

How to repair:

a) Insert the Windows 7 System Repair DVD or Installation DVD or Bootable Windows 7 Pen drive and reboot.
b) Select the correct keyboard input method and click ‘Next’.
Note: If you are using the Windows7 Install  then at the 'Install Now' prompt (Do not pick the Install Now option) instead choose the 'Repair your computer' option located in the lower left of the dispay.

c) Click ‘Next’ at the keyboard selection prompt and when the ‘System Recovery Options’ screen appears verify that the “Use recovery tools that can help fix problems starting Windows” is selected.
Note that on your Dual Boot system there now should be only one operating system listed. Click the ‘Next’ button.
d) Now from the menu list select the ‘Command Prompt’ option.
e) At the DOS prompt type the following three commands:
bootrec.exe  /fixmbr
bootrec.exe  /fixboot (may return an 'Eliment not found' message)
bootrec.exe  /RebuildBcd
f) Close the command prompt window and Restart.

I hope it works...!!
If any issues and errors comment below.
I'll surely try to solve..