you guys better love me for this..... buy me cookies and stuff........
i had the same problem and have now fixed it!!!!!
The problem is that your OpenAL file is out of date, theres a simple fix:
IMPORTANT: before you do this, make sure you delete this file - C:\WINDOWS\system32\OpenAL32.dll
Then visit- http://developer.creative.com/article....&aid=46
and download the installer.
running the installer will replace the file you deleted and sort the problem, please let me know if it works!