Folder Declared Private On My Old Network

I recently upgraded my computer's CPU/Motherboard/RAM etc however, after plugging in my old hard drives, Windows failed to load. In an effort to save my old files I reinstalled windows XP on my secondary hard drive, hoping to access my original hard drive's files through the reinstalled version of windows. Everything went according to plan except when trying to access the old My Documents folder, and the computer says Access denied, probably because that folder was declared private on my old network and because the user account was password protected.