"No Audio Device Installed" in taskbar message. Intel Troubleshooting efforts appear circular. Latest BIOS and Chipset*.INF haven't resolved. Device manager won't show "Sound, Video, Game Controllers" category. System devices shows "High Definition Audio Controller". This uses a generic Microsoft driver: 07.13.2009, version 6.1.7600.16385.
Should the Intel x38BT board be using generic (UAA) microsoft drivers? Surely there is a problem preventing correct install of the Intdriver. Inspection of the REGISTRY shows references to "amd64" shouldn't this be "x86"