whappo

I have tried several programs on vista to try to add xp to the vista boot loader (both on separate hard drives). Basically right now, the only way to switch the booting os is by physically unplugging one hd or the other, or by changing bootup settings in the bios. I was thinking maybe the easiest would be to install linux and have it use grub to bring it all together? I'd prefer not having to go this route though. Help me please Thanks!