You probably need to format the hard drive first.
Boot with the Windows CD and format the hard drive - then install Windows.
If that doesn't work, get the installation boot disks from Microsoft:
How to obtain Windows XP Setup boot diskshttp://support.microsoft.com/?kbid=310994
Make sure you get the ones that match your XP CD - not what you had finally installed on your computer by updating it.
You may need to change the boot order in your bios.
Edited by Enthusiast, 02 August 2006 - 06:34 PM.