I have had Windows XP installed and running smoothly on my PC for 18 months, never had to reinstall it (disabled system restore from day 1)

Windows 2000 is far easier to install, much faster and smoother, less resource hungry and better all round. It doesn't have service packs that lag the sytem down and has almost the same amount of hardware support as XP.

Why am I using XP?

Simply because it is a newer operating system, and I can't be bothered with the dual boot system I had.

I run a small business repairing computers and installing operating systems. I would love to install 2000 into all of my client PC's but they ALL request XP for the same reason I use XP.