If you are running multiboot operating systems from your hard drive then you will require GRUB. It is a boot loader package from the GNU Project. GRUB is the reference implementation of the Multiboot Specification, which allows a user to have several different operating systems on their computer at once, and to choose which one to run when the computer starts. With GRUB, it can be used to select from different kernel images available on a particular operating system’s partitions, as well as to pass boot-time parameters to such kernels.

However, if you are facing difficulties with your GRUB and would like to remove it from the Master Boot Record (MBR) of your hard drive, there are two ways to do so:

1. If you have Windows XP installed, then you can boot to XP’s recovery console and run the “fixmbr”. (Microsoft’s Help and Support)

2. You could download SuperGrubDisk and fix your xp bootloader. You could delete the MBR but first, make a backup. Assuming that you have one disk, sda, run the following command as root:

dd if=/dev/sda of=/home/xxxx/bkupmbr.img bs=446 count=1

Replace xxxx with whatever your user name is. Command above makes backup of mbr.

To delete mbr run command:

dd if=/dev/zero of=/dev/sda bs=446 count=1

Happy Trying!.