|You can start your PC with XP disk in the disk tray of your CD-ROM and format the hard disk and continue with installation of XP.|
You have two prerequisites for installing XP.
1-- Configure your PC's BIOS to boot to CD/DVD-ROM first
2a-- Have hard disk SATA drivers handy on diskette, which means you must have a diskette drive in your PC
2b-- you must configure, if you can, your hard disk controller in BIOS to compatibility mode/IDE mode,whatever your BIOS reads.