I dont use an Audigy (still going with my SBLive 5.1 till xmas) but creative drivers are not renowned for their perfect track record.
Maybe give those drivers a try :
www.kxproject.com
I had to switch to them when I build my new PC because the creative driver simply sucked with all the new hardware (which btw. is a known problem). After I installed the KX Drivers everything worked perfectly (actually even better then before).
Oh and as mentioned before, DW works well under XP without any compability mode.