Hi PoD
Xp will format it as it installs.
Go into BIOS, usually by hitting DEL after the post beep on start up.
Change the boot device sequence to boot from CD rom as the first or only option.
Follow the instructions on screen, it will ask you if you want to format FULL or QUICK in FAT32 or in NTFS, whichever format you decide on doa ful format.
If the drive is over 32 gig then XP cant format it in FAT 32 unless you partition it into 32 gig or less.
You will need to reinstall all the drivers, graphics and soundcards etc but XP may have a lot of them built in so you may not need the original driver cd.
Dont forget to go back into BIOS after XP has fully installed and reset the boot sequence.
I hope that this helps