Is it still possible to mine on a windows 2000 machine?
Thanks
Yeah, especially if you upgrade it with a new mobo, power supply, SSD, and 7500-series or better GPUs
On the serious side, you could do a little pool mining on the lighter crypto-currencies (LTC/FC), but your accepted shares per watt-hour would be vanishingly small. For Bitcoin mining, probably any share you submitted would be stale.