Disconnect the IDE drive.
Boot from XP install CD.
Enter recovery console.
Type "bootcfg /rebuild" (don't forget the space)
Set the SCSI disk as primary boot device.
SCSI controller drivers should already be installed because Windows worked before.
If Windows boots, re-connect the IDE disk (you can also disable it in BIOS instead of unplugging it.
After Windows booted, format the IDE disk.
TheMajorMMX - Intel P200 MMX @ 225Mhz - V-Tech (PcPartner) Baby-AT mb w/ Intel Triton TX chipset - Nvidia Riva TNT2 M64 w/ 16MB - 256MB M-Tec SDRAM - Still running.....