humm.... installing winXP.... well just go to ur BIOS by presing "del" (or what ever key to go to BIOS).... then make sure ur first boot device is CD ROM.... save the config... insert the XP installation CD.... restart...... when aksed press a key to boot from CD ROM... & then just follow the on screen intruction...... the instalation will guide u through.... & anotherthing dont forget to backup ur data