To recover grub boot loader install Easy bcd you can download it from cnet
1. Once you have installed easy bcd open it
2.Go to option add new entry in left pan
3. Now click on tab linux /BSD
4. Select grub2 (which is latest grub boot loader) from type
5. Type any name say "my linux" which you want to display in menu
6. Click on Add entry, you will see message flashing in left bottom corner "my linux has been added successfully"
Now restart your system and enjoy.
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