There are no Win2k drivers available for the Aureal Vortex2 soundchip (AU8830) on ANY card (including Aureal's card, I/O Magik's, MX300, TB Montego II, etc.). The ones on the web are old beta drivers and were never finished. That sux because it's a great sound chip.
Too many problems with Soundblaster cards, and they don't sound so good anyway. If you want good cheap sound, I recommend an ESS chip soundcard, like the MX400 or even a generic Canyon 3D chip card (~$20). If you want high quality sound I recommend the Phillips Acoustic Edge.