You have two options basically:
First, if you have a <font color=red>legitimate</font color=red> copy of some Adaptec software, you can download an ASPI layer program from the adaptec web site. Do a search on their website for ASPI, the file is called aspi32.exe
Second, look around the web for "free" ASPI layer utilities. I know a few are under development; I have no idea where to get them.
Adaptec is wrong, Win2k does not natively support ASPI.
Good luck!