HP Pavilion dv2550se ICH9M-EM SATA AHCI Controller Driver

if the blue scree on death appears on your HP Pavilion dv2550se while installing windows xp, you need ICH9M-EM SATA AHCI Controller Driver.
incorporate the driver into your Windows XP installation CD by using software such as nLite.

ICH9M-EM SATA AHCI Controller Driver
(Download)