Try this to fix the no sound issue

[Lord_Blight]

I found this in another post but thought it would be helpful moving it to the top.
It requires no reboot and worked for me after trying the accerleration fix and a new driver.


http://connect.creativelabs.com/developer/Wiki/OpenAL%20Installer%20for%20Windows.aspx

This is from this post http://forums.eidosgames.com/showthread.php?t=94122