There is still some problems with the drivers for win2000. Right now the best OS to use would be win98 for you. Yamaha has ASIO2 drivers out w/30ms. latency. Hopefully Yamaha will update their win2000 driver soon. Ive been waiting for good winNT(or win2000) drivers since the cards came out.
Check www.xgfactory.com for driver updates.

DudeManCentral