Enter BIOS setup and desable AHCI suport, or...
Download the drivers needed to support AHCI...Intel Matrix Storage Manager driver", iaStor.sys.
Save the files to floppy or integrate them to the XP installation disk.
While XP setup boots you will be asked if you want to load some RAID drivers and press F2 (I think) to load them from the floppy.
But much easyer way to go thru this is by desabling the AHCI support during the installation of XP.
Once you install XP, install all the drivers needed and enable it again.
You can download all the drivers you need from here:http://support.fujitsu-siemens.com/com/ ... loads.html
Just select your model.