Easiest way is as follows , get a copy of system rescue cd
http://www.sysresccd.org/SystemRescueCd_Homepage
then boot from CD/DVD drive using system rescue CD , then you will get the option for BOOT AN EXISTING LINUX PARTITION ,choose it. after you have booted into linux go to package manager and search for grub or grub2 depending on your distro and then simply re-install it
http://www.sysresccd.org/SystemRescueCd_Homepage
then boot from CD/DVD drive using system rescue CD , then you will get the option for BOOT AN EXISTING LINUX PARTITION ,choose it. after you have booted into linux go to package manager and search for grub or grub2 depending on your distro and then simply re-install it