grub re-installation after windows installation

it is very simple to re-install the grub after the windows installation. just follow the steps given below.

• boot the system from a live cd
• open terminal
• type sudo grub

            you will get a new prompt showing
                  grub>

• type the following commands in this prompt
• find /boot/grub/stage1

             you will get an output such as
                grub>(hd0,3)

• root (hd0,3)
  

                you have to use the output of the previous command here

•   setup (hd0)

            this will install grub in your boot loader

• now type exit to go out of the grub prompt

• reboot the system, your grub will be restored. if there is any problem pls comment here.