i had the same problem
Hello. I had EXACTLY the same problem. The problem is with win7 beta build 7000, 7100, RC and 7127 (all releases)
I tryed to use the onboard audio, the problem is still there, after a few hour after power on, the problem appear.
I try also the audigy SE (and i disabled the onboard audio from BIOS) and the problem persist. I have the latest drivers from creative support site (drivers for windows 7)
With windows XP sound works just fine, never had problems
Anyone else having this problem ?
PS: forgive my english ....
LE : EVRIKA ! i think i foud a solution. HPET is the problem. In bios, HPET was disabled .... i enebled it right now, i hope this was the problem for myu sound. In vista also has to be...