Howto reconfigure broken grub

When our grub is broken because of install new windows or our MBR is broken, so we can’t boot on linux.

To normalize grub we can do 2 ways, by using Live CD or we can enter into linux terminal.

For the first time we have to boot by live cd and next we have to do:
1. Open terminal
2. sudo grub
3. grub> find /boot/grub/stage1
(hd0,0)
4. grub> root (hd0,0)
5. grub> setup (hd0)
6. quit
7. Reboot