>Be careful, WIN 2k is not a gaming OS.
I'll agree with sxamiga, but only with a caveat. Win2k isn't an OS for gamers if they have older hardware and/or can't get updated drivers for said hardware. Initially the problems that came about with Win2k were predominately the fault of buggy drivers (which is often the case, actually).
When Win2k was first released I recall C|Net doing a review in which quite a few games actually saw speed *gains* in Win2k, despite the architecture being somewhat new. Just recently I was reading a review of the Geforce 2 MX 400 and realized that there were some considerable performance improvements to be had simply by running Win2k. There's a few titles that simply refuse to run under Win2k (VGS and FF7PC, for example). While there are patches to circumvent the problem in some cases, recall too that you can have Win9x *and* Win2k installed at the same time, so if you have such a program, you can always reboot if need be.
If you have an older system and a small amount of ram I would suggest sticking with an earlier version, as Win2k would surely just aggravate you. Otherwise, do some research, see if all your hardware is supported, and give it a try, I think you'll be pleased.