I understand that you are having problems installing Windows* XP on the Intel(R) Desktop Board D525MW and you need to know how to install the Advanced Host Controller Interface (AHCI) drivers.
IN regards to your inquire, Windows* XP does not fully support Advanced Host Controller Interface (AHCI) mode, the easiest way is to set the SATA ports to IDE mode and install the operating system with no further complications.
There is a way to install Windows* XP on Advanced Host Controller Interface (AHCI) mode, you need to use a USB floppy that is supported by Microsoft* to load the drivers from a floppy or you can make a slipstream of the drivers in to the operating system installation disk. There is a lot of information on how to perform this process over the Internet that you can find it very easily.
The drivers that you will need can be found at the following web site: