Did you run any specific hardware or something? W2k was rock solid for me from RC2 and onwards. The only thing that really didn't run stable was the drivers for Via's crappy chipset, and they released improved drivers fairly quickly.

No same hardware I ran NT on, although most of my machines were dual processor which was rather rare at the time.

Ah, that could be it then. I've never experienced W2K as anything but rock solid, but then I never had anything faster than a K6-2 back then. :D