Hi, I have encountered this issue recently. 1. My system was working fine. 2. I installed an ASUS EAH4770 video card which has HDMI port built in. 3. Installed an old game Call of Duty 2 and played. 4. Then PC started to go to Hardware Wizard after booting up and trying to find and install Hdaudbus.sys (UAA HD audio class driver). Of course, fail to install. However, the audio was still fine. 5. Finally, decided to resolve this. Found the MS kb888111 fix. Use a trick to install it on SP3 and the version is 18.104.22.16813. 6. Boot up. UAA is found and installed. No more nagging wizard. 7. Then sounds begin to have problems: a. If I set <None> in the Environment field of Realtek Sound Manager, some sounds would not be heard while some sounds were still fine. For example, the main vocal in a song may be very hard to hear while the accompanying instruments are clear and loud. b. If I set Generic in the Environment field, the above main vocal can be heard but every sound trails with this electronic guitar effect. c. If I play the 3D audio demo of the Realtek Sound Manger, it sounds OK. Yes, I have re-installed all the latest drivers from the manufacture of the MB. Install kb888111 a couple of times. But there is no avail. It looks like the mixer is messed up. Has anyone encountered such a problem? Dxdlg output: MB: Biostar TF7050-M2 w/ onboard Realtek ALC888-812 chipset Video: ASUS EAH4770 OS: Windows XP Professional (5.1, Build 2600) Service Pack 3 Language: English (Regional Setting: English) System Manufacturer: BIOSTAR Group BIOS: Phoenix - Award WorkstationBIOS v6.00PG Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4600+, MMX, 3DNow (2 CPUs), ~2.4GHz DirectX Version: DirectX 9.0c (4.09.0000.0904) ------------- Sound Devices ------------- Description: Realtek HD Audio output Default Sound Playback: Yes Default Voice Playback: Yes Hardware ID: HDAUDIO\FUNC_01&VEN_10EC&DEV_0888&SUBSYS_1565E601&REV_1000 Manufacturer ID: 1 Product ID: 100 Type: WDM Driver Name: RtkHDAud.sys Driver Version: 5.10.0000.5969 (English) Driver Attributes: Final Retail WHQL Logo'd: Yes Date and Size: 10/28/2009 11:35:10, 5937152 bytes Other Files: Driver Provider: Realtek Semiconductor Corp. HW Accel Level: Full Cap Flags: 0xF5F Min/Max Sample Rate: 8000, 192000 Static/Strm HW Mix Bufs: 33, 32 Static/Strm HW 3D Bufs: 33, 32 HW Memory: 0 Voice Management: No EAX(tm) 2.0 Listen/Src: Yes, Yes I3DL2(tm) Listen/Src: Yes, Yes Sensaura(tm) ZoomFX(tm): No Registry: OK Sound Test Result: Not run DxDiag Notes ------------ DirectX Files Tab: No problems found. Display Tab 1: The file ati2dvag.dll is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer. Sound Tab 1: No problems found. Sound Tab 2: No problems found. Sound Tab 3: No problems found. Music Tab: No problems found. Input Tab: No problems found. Network Tab: No problems found.