How to remove GRUB loader!?
Posted by jbirkett
I do know why DOS FDISK won't work, but I was able to accomplish the fix with FIXBOOT and FIXMBR, then BOOTCFG.
It only worked if I was in the root directory for the instance that I wanted to fix:
when selecting repair function used
after all that I was able to select the new entry from the selection menu.
Like I said, I don't know why you could not get it to work.