For what it is worth, the majority of OS-problems on this website stem from Windows 98 and Windows XP.
There are very few issues with Windows 2000 pro (which I use). It does not have the bloat of XP and it does not have the mumbo-jumbo with forced registering at M$.
My last install was in January 2003 and the only updates made were SP4 and some hotfixes. It has been rock-solid all that time.
The only issue I have is with my Logitech MX700 wireless mouse, which freezes every once in a while, but I am blaming this on the Via KT333 chipset on my mobo and inadequate Via Hyperion drivers.
Eventually I will by a mobo with nVidia chipset, which seems to cope better with this.
So, Thumbs Up for Windows 2000 Pro.