Asus X51RL laptop, vista, xp

Asus X51RL laptop, 2GB RAM, 160GB SATA Seagate HDD, BIOS upgraded to newest version 204. Current OS is Vista Home.
Problem: I tried to get rid of Vista and install XP Pro, but no success, tried different CD, SP2, SP3 (CDs work fine in other PCs) no success, tried to use nLite and integrate SATA drivers, no success either , though I'm not sure if I used the correct drivers.
There is no such option to change IDE/SATA/RAID settings in the AMI BIOS.

Where I got so far:
I set up boot device priority to CD, when I restart, it asks to ''press any key to boot from CD'' , I hit a key, then ''_'' appears in the upper left corner blinking for few seconds and then blank screen. CD spins and makes noise, but nothing happens on screen. I never got to the blue screen saying ''setup is inspecting your hardware configuration''

questions: what do I have to do in order to get XP on Asus X51RL laptop and therefore delete Vista (I don't want Dualboot)

If nLite is the only option, what driver do I need (please post a link or full decription and name.

thanks