You need to ensure that the disc is configured correctly at the back of
the drive with the jumper link, there's normally a diagram on the top
telling which links to use, also ensure the hard drive is recognized in
bios, if using a single hard drive this should be HDD0, if unsure you
could always use cable select marked CS.
Here's a link that may help 'How to Install or Repair XP'
(
http://www.michaelstevenstech.com/XPrepairinstall.htm)
Make the CD the first bootable device as we need to boot from this and
the Hard disk the 2nd or disabled... half way through the installation
you'll get "Rebooting in #### seconds" you need to remove the CD before
the computer boots as from now you'll need to set the Hard drive as the
1st bootable device... the rest can be disabled since from now on you'll
always be booting from the hard drive.
davy