How to restore grub2 menu after installation of Windows 10

English Install/Boot/Login
#1

Hi I have installed Windows 10 and so in order to restore grub I have booted into rescue mode using opensuse 13.2 disk and followed the procedure provided in the following link

https://forums.opensuse.org/content.php/128-Re-install-Grub2-from-DVD-Rescue

At present when I am in rescue mode and after issuing the command grub2-install /dev/sda I am getting message as installing i386 grub and finally after rebooting I am getting a blank screen with no entry for Opensuse 13.2.

Help me to restore the grub menu.

#2

Do your openSUSE and Windows use legacy BIOS or EFI installation types?

#3

If you mix modes it won’t work right.

#4

As I am new to EFI can you please explain about these and how to find whether my operating systems are using legacy bios or EFI.