|It may be that you have SATA hard disk drives, and the controller is not supported.|
Has XP ever worked? If it did, this is likely not the problem, since XP doesn't natively have SATA support = if it worked, your drive is not SATA.
To troubleshoot, examine your BIOS for an option relating to SATA mode. The options may include "enhanced" and "compatibility" or similar; you'd want to switch to compatibility (essentially makes the drive appear to be ATA, not SATA).
If drive shows up now during setup, you know the problem: you need SATA drivers for 2003. Note that if you install with controller in one mode you cannot change modes after installing.