I'm pretty sure you need to be using a server version of Win2k to run file services for Macintosh. I have it running on my Advanced Server and it was very easy to set up. The Windows help system walks you right through it. I access the Win2k box from Macs running OS 8.1, 8.5, and 9.0 with no problems. Can also save MAc files on the 2k box without losing the stupid resource fork (i.e., Mac files don't get screwed up after being saved on the Win box).
Or else use DAVE on the Mac or PCMacLan on the 2k box. Each costs about $150, though.