is XP damaged and you cant boot? why cant you do a normal install? here is a way to install XP and to save your files. you will need to burn two CD's or use USB flash drives.
get
gparted
++resize your prexisting partion to make remove for a new partion
++creat a FAT32 partion size depends on how much you want to backup
get
knoppix
++boot from knoppix
++mount your XP and FAT32 "drives"
++copy every thing you need from XP to FAT32 "drive"
boot gparted
++format XP partion to NTFS
boot XP
++install XP on NTFS partion
++copy files from FAT32 partion over to NTFS partion
boot gparted
++delete FAT32 partion
++resize ntfs partion entire drive size