跪求高手指導:如何downgrade Vista to XP

小妹有東芝L45筆記本是Vista operating system. But I know my machine is not capable to run vista so I need to downgrade to XP, but I was driven crazy through out the installation process:
(1) 用國產最新GHOST(電腦店專用)先把Hand Driver Partitioned;
(2) CD-Rom set as boot device, then run GHOST to install XP. It seems ok, looks like SATA driver is included in my booting disc.The entire installtion seems smooth and perfect.
(3) However, when I changed boot device back to hard disk booting after setting up in BIOS, but system would not boot up. Instead it asks for booting disc. In other words, it still cannot boot up from Hard driver.
(4) check hard driver again and it has been added some content, which I guess it is window XP OP.

請個位高手指點,死也不用Vista!!!!!!!!!不然隻有退機.