Windows 2000 was quite good actually, also 98SE.
I never used 2k much, but I understand it was based on NT, sort of a proto-XP, so there's that at least.
I never had much trouble with 98SE -- it was back in the days when, system startup time doesn't take long, so, you shut down every night when going to bed, and boot it in the morning. Most days, you wouldn't even get a BSoD. If you happened to leave it running for a few days, well, that's your problem. I think the most unstable software I had was Adobe Reader 5 (amirite?).
But others have had notorious trouble with 98SE. Probably as much due to hardware differences (and buggy drivers) as operator error. Which is still the case today; not much can BSoD an XP+ system, besides drivers.
Tim