Can somebody help me please....

Hello, I have a Fujitsu Siemens Amilo Pi 1556 Just like Rogier.
I wanna slipstream a new xp because I can t start my pc with the backup cd, I have already
tried with Iso-builder, but I m not sure if I put the good drivers in it.
The pc says that it can't recenoize a hard drive, in the bios I see a hard drive, I have a Sata 120Gb.
I ve read a lil bit on the internet, I m not the only one with this problems.
I m not really good in computers, Iso builder wasn t very difficult, so if someone can tell me how I can do it on a simple way, I ll appreciat that.
Thanks