i have just the same problem. I format the HD, winxp copies the instalation files to the HD and reboots. Now it starts up from the HD (to begin winXP instalation interface), but it shows me the message "parameter error" and then reboots. When it loads winxp again, i see the message "the instalation program is restarting the PC...". That's where the process gets stuck (goes in a loop, infinitely) . I instaled hotfixes, IE7, 2 drivers, removed some componets and setted some optimizations. but I dont know what is the problem...