Given such slim details it sounds as if the machine needs repairs or new hard disks, etc.
my pc is an old p4 1.4,128 rambus ram. I am trying to put a bigger hard drive,30 gig fireball. I boot with the xp disc in and when it goes through the install and reboots it starts all over again. and if you take out the disk after install, it says no os found.PLEASE help.