Ubuntu 13.04 won't boot and boot repair doesn't work

Ubuntu 13.04 won't boot and boot repair doesn't work

As the title says I installed it again and again but it won't boot and it
turns out GRUB is conflicting or something like that with UEFI bios so I
downloaded the boot repair disk and used it to fix GRUB and it gets to a
point that it gives me a window telling me what to do if the remove GRUB
window shows the problem is the remove GRUB window doesnt show up so I
can't remove so can anybody help me? It's also worth mentioning that when
I go to download the boot repair disk it says it's 532MB but when I
download it I find it to be 508MB and I downloaded it several times and
it's the same case so is that normal and thanks in advance