I have a similar problem with my DG45ID hooked up to my receiver with optical. I'm running Windows 7 32bit. If I install the drivers (6224.3 v182) I have issues with flash and windows media player. If I revert back to the windows drivers everything is stable again. My audio quality seems fine with either driver.
Installing the previous version 6224 v1.78 has the same effect.
*Update* Appears to be a conflict between onboard and ATI video card with hdmi sound in my case.
Message was edited by: avandyk
Similar problems: DG45ID, replaced DP35DP (not supported for win 7), E8400, 4 GB RAM, all hardware previously working on DP35DP with Win XP. Clean install of Win 7 32-bit. After installing AUD_ALLOS_6224.3_PV_IDTGUI_V182.exe, system shutdown would hang on playing shutdown sound. Then a variety of other hangs would also occur. Windows Media Player would not respond to play a music CD. All Windows updates applied (as of 5-23-10), but Microsoft LiveChat LX-3000 headphones would not work. Uninstalled Intel Audio and all is working well. Aslo noted that Intel Audio application software does not have options for USB headphones (only mini-stereo jacks, the most unreliable connector in my 30 years of computer experience). The Intel software application also does not allow auto-switching between rear stereo speakers and front headphones. Windows software supports both sound outputs, but does not auto-detect the change. I have (4) Intel front audio + USB + 1396 panels, that I used on DP35DP and earlier Intel boards and the Intel supplied software application supported auto-detect when changing audio output, Why is the technology going backwards? My expectation is that systems should be designed to auto-detect front/rear audio output without add-on hardware.