I have installed a few games in windows 2000 and had sucess with them, but I believe the reason for your problem with the 7th Guest is that your sound cards drivers were loaded from the autoexec.bat in DOS before windows started and so the sound was actually DOS sound drivers. Win2k does not have DOS so the sound drivers are not loaded and hence, no sound. I have experimented with some other DOS apps with the same problem on every one
ATI is the best company...... crappy video cards, high prices, what more could you ask for?