The installation proceeded fine until the Reboot step. Instead of opening the XP install sequence I got a message telling me that
"a Disk Error Occurred. Press Ctrl-alt-del To Restart"
I tried twice, even formatting (quick)the disk but no joy. Since the XP installation reset the boot loader, I had to use the Win 7 disk to reset it.
I have installed a second disk dual boot XP on Vista systems so I don't think that it is related to Win 7