Some misinformation below. You CAN do a Windows XP clean install from a
Windows XP Upgrade CD. Set your System Setup to boot from the CD drive.
(Usually the first screen after the manufacturer's logo says something like
"Press F1 key to enter Setup" or something like that. If might be a
different key, depending on the make of the system. Once in System Setup
(BIOS) move around until you find the screen that has the drive boot
sequence setup, and move the CD drive to the first boot device, save
settings and exit Setup.) Then boot with the Windows XP Upgrade CD and
proceed with a New Install, where you'll be given options for formatting and
partitioning the drive. If at some point you're informed that the upgrade
can't find a prior version of Windows, eject the Upgrade CD and insert a
Windows 98 CD or Windows ME CD, and point to browse to that CD for upgrade
eligibility. When upgrade eligibility is accepted, swap back to the Windows
XP Upgrade CD and continue with the install. Don't forget to select the
option for New Installation, where you'll be able to configure special
options like formatting, partitioning etc...