Here is the fix for the hal.dll error when you try to install Windows XP with OSX Boot Camp on an Intel Mac.
format C: /Q /FS: NTFS
After it is done formating the drive type exit to reboot the computer.
Go in to the Windows XP cd
When the drive screen comes hit the up down arow until you get to drive c
hit enter or return key. Do not reformat the drive.
install your windows xp.