Delete? Or use a different one? Basically, you have to have a bootloader,
it's just a matter of which one you want to use. That is partially dependent
on what OS or OS's you are booting. Rather than delete, you change the mbr
to point to the bootloader of choice, then you can remove the unused
bootloader files. How you change the mbr depends (again) on the bootloader
you want to use.
