ABIT ATA/66 Problems

I have an ABIT BP6 Mobo with an onboard ATA/66 controller made by Highpoint Technologies. My Win2000 system has the latest Bios and HPT366 (the ATA controller) drivers installed. I can boot to Safe Mode, and the system operates fine, but when I boot normally I get a BSOD and an IRQ_LESS_THAN error message right as the splash screen finishes loading. I’ve tried ACPI on and off, And all possible configs of PNP OS = Yes or No. Still it won’t boot. Both the drives are seen by the ATA66 BIOS. I can boot them normally if I use normal EIDE.
TIA