Sata Driver Inspiron N5010 to install windows XP

Hi, I have a Inspiron N5010 notebook with win7HB64 , this notebook have online support only for 64 bit OS Vista & 7. There is no support for any 32 bit OS. Now i want to install and run XP (32 bit ) on my notebook & on my external HDD (i have successfully done it on my old desktop with asus motherboard). I Know its not straight forward, i searched net a lot and found some solutions for other notebooks, Installing on External HDD is much important for me. i'm ready for complex task, Can anybody help me out...would be most appreciated .

Things i know : would need SATA drivers for my notebook, would need to make a special arrangement for USB drivers too & it is possible.

Things i do not know : where is my Notebooks SATA driver for XP installation, stepwise procedure for both ( sata drivers & USB integration into special Disk)