Sorry if I am wrong, but that sounds like this one:
Other threadI've had the same problem and the feeling that it had something to do with sound aswell. I don't know what I did, but it works again on my PC and it was
definitly not correlated to WLAN, as I got LAN.
Ah, well, sure I know what I did: I reinstalled my whole computer...
Well, I think it was not too much help, but maybe the other thread somehow helps you - and at least I supported your theory
Good luck!
Clintstone