There is a New Soundmax driver for AD2000 and AD1988 for Windows 7. I had tested it in my Windows 7 64bit.
I had a new Asus Crosshair II Formula motherboard from RMA the Crosshair. With the help of the new SoundMax driver, my computer work great!
Download the SoundMax driver via the FTP server:
ftp://ftp.asus.com.tw/pub/ASUS/misc/audio/AD200B_6570_Win7.zip