I have a dual boot system with Home and Professional on it, and I'm trying to edit a harddrive from another computer. Windows XP Home is my default OS, and that's the HDD I am removing from the computer to be able to edit the HDD from the other computer. I have placed the jumpers correctly, at first they were in Cable Select, then I chose to Master and Slave the drives. But with every configuration I still got the "Error Loading OS" error, so I placed the HDD with Home back in, and slaved the HDD with my Professional to see if the disk had been messed up. Which it wasn't I am using right now. I was wondering if I need to add a "boot.ini" file to my HDD with Professional on it, as I am thinking that the HDD with Home on it has the boot.ini file. I'm confused.