Did you look at How to re-install bootstrap code (GRUB)? [by YBellefeuille]
Quote:grub> setup (hd2)There's the problem, I think. Your CentOS partition is on hd2, but you should install G... [by YBellefeuille]
After going through the install wiki and doing it like it said, I thought I was installing grub to my MBR. Now I have found out some of grub's files are located on my Arch / partition.