When you get your MOBO installed, and prior to installing Win2K be sure to flash it with the Bp6QQ bios recently available at:
ftp://ftp.abit.com.tw/pub/beta/bp6/bios/bp6qq.exe.
Without this flash, Win2K will not recognize the BP6 as an ACPI board, nor will it run USB in MPS 1.4 mode.
Although this bios revision is currently in Beta, it's solved a host of problems for me.
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Abit BP6, Dual Cel 466's OC'd to 525, Win2K, WinNT4 SP6a, Win98SE