*bangs head on desk*
A: Get into your BIOS, SATA controllers can emulate IDE operation for legacy OS via a BIOS option. Typically SATA operation is AHCI or SATA, and IDE operation is labeled IDE(SOMETIMES AHCI but rarely). If you set it to IDE operation XP/2k will view the disks as IDE disks and mount them.
XP SP3 DOES NOT support SATA naively.
B: Google, install and run HWINFO32; find the type of motherboard you have, hit the manufacturers website, download the SATA drivers. They should be in their own folder; it'll consist of a .inf and multiple sys files. Copy those files to the root directory of a floppy. Put in the windows disk, wait for the installer to ask "hit f5 to install 3rd party drivers"; hit F5, it'll scan the floppy and prompt you for what drivers you want to install. Select which drivers you want, and the install will detect the SATA disks and go merrily on it's way.
With 4 SATA disks you're going to want to use RAID I'm sure; you can do this using the above process so long as the correct drivers and controller type are selected.