The clicking HD issue is probably one of two things. It is either the HD or the power supply.
Quantums are notorious for your specific problem. It will continue to click and have wierd problems intermittently and then just die. Clicking HD is 99.9% a hardware problem.
Power supplies are also the source of most intermittent problems. Not enough power (like 200 watt power supply and you are running 2 hard drives, a CD writer, CD Rom, etc...) or dirty power (No UPS or Surge Protection). Always use an UPS with surge protection and buy a power supply that begins with 200 watts and add 50 watts per device.
1 CD Burner
Buy 350 watt power supply.
Believe it or not, I have had few problems with Win2K. I use Win2K and RedHat 7.2. I think it is MS best release to date. <Let flames Begin>
Hope this helps...