DAEtrader,
Windows 2000 Professional is Windows NT 5.0. I've used it for almost a year now on multiple PCs, and I've had zero operating system related lockups and zero problems compared to Win98. The product migration at Microsoft is to NT, even for the consumer operating system.
The stability issue seems to arise from the fact that Win2000 does not readily misbehave or freeze when some program acts up, some conflict is encountered, or when system resources are severely taxed. This stability is essential if your trading is serious business.
The downside to Win2000 at this time is that it is a business operating system, and the home-user running entertainment media, games, certain video cards, and other consumer software or devices may find that Win2000 is not supported. If you are upgrading to Win2000, be sure that all your hardware and software is Win2000 compatible. Win2000 also has a substantial feature set for the corporate and workgroup environment that the typical home user will never need.
For serious trading, the operating system choice is clearly
NT.