I have an amilo pro v3505. I had the same problems, and i installed the microsoft update. After that I was able to install the sound driver, but after the installation, nothing happens. I restart the system, and the sound driver appears in the installed applications list, but I can't hear anything and windows media player and winamp, both give me an error when I'm tryying to play a file. Do you have any idea, what the problem could be?