As far as I know it really is just a coincidence that the only two computers to fail booting the WinPE CD are the ones with the Athlon XP CPU. One of them has an IDE CD ROM and the other is a SATA CD ROM. Both boards are too old to recognize USB as a valid boot device. Honestly I think I can convince the client to just upgrade the systems. They're old anyway. Thank you for commenting! Regards, Dassala