I just got Fallout 3 New Vegas, and it looks amazing so far. The problem is is that for some reason, I can't hear any sound from NPCs during any conversation (or when I'm walking by).I see their lips moving, but no noise comes out. I tried the strategy mentioned in the sticky (Read before your post), but it didn't do anything. I attached my DXDIAG, if it helps. Thanks in advance.
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System Information
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Time of this report: 11/2/2010, 18:39:21
Machine name: LOGAN-PC
Operating System: Windows 7 Home Premium 32-bit (6.1, Build 7600) (7600.win7_gdr.100618-1621)
Language: English (Regional Setting: English)
System Manufacturer: LENOVO
System Model: 2767CTO
BIOS: Ver 1.00PARTTBL(
Processor: Intel? Core?2 Duo CPU P8600 @ 2.40GHz (2 CPUs), ~2.4GHz
Memory: 2048MB RAM
Available OS Memory: 1944MB RAM
Page File: 1391MB used, 2496MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 32bit Unicode

------------
DxDiag Notes
------------
Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Input Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

---------------
Display Devices
---------------
Card name: ATI Mobility Radeon HD 3400 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x95C4)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_95C4&SUBSYS_210F17AA&REV_00
Display Memory: 969 MB
Dedicated Memory: 253 MB
Shared Memory: 716 MB
Current Mode: 1280 x 800 (32 bit) (60Hz)
Monitor Name: ThinkPad Display 1280x800
Monitor Model: unknown
Monitor Id: LEN4031
Native Mode: 1280 x 800(p) (60.002Hz)
Output Type: Internal
Driver Name: atiumdag.dll,atidxx32.dll,atidxx64,atiumdva.cap,atiumd64,atiumd6a,atitmm64
Driver File Version: 8.14.0010.0685 (English)
Driver Version: 8.641.1.1000
DDI Version: 10.1
Driver Model: WDDM 1.1
Driver Attributes: Final Retail
Driver Date/Size: 8/24/2009 19:40:10, 3368448 bytes
WHQL Logo'd: n/a
WHQL Date Stamp: n/a
Device Identifier: {D7B71EE2-D684-11CF-B563-0E01A1C2CA35}
Vendor ID: 0x1002
Device ID: 0x95C4
SubSys ID: 0x210F17AA
Revision ID: 0x0000
Driver Strong Name: oem41.inf:ATI.Mfg.NTx86.6.1:ati2mtag_M72_PXAI:8.641.1.1000:pci\ven_1002&dev_95c4&subsys_210f17aa
Rank Of Driver: 00E60001
Video Accel: ModeMPEG2_A ModeMPEG2_C
Deinterlace Caps: {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(UYVY,UYVY) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
{335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalStretch
{5A54A0C9-C7EC-4BD9-8EDE-F3C75DC4393B}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY
D3D9 Overlay: Not Supported
DXVA-HD: Not Supported
DDraw Status: Enabled
D3D Status: Enabled
AGP Status: Enabled

-------------
Sound Devices
-------------
Description: Speakers (Conexant High Definition SmartAudio 221)
Default Sound Playback: Yes
Default Voice Playback: Yes
Hardware ID: HDAUDIO\FUNC_01&VEN_14F1&DEV_5051&SUBSYS_17AA211C&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: CHDRT32.sys
Driver Version: 4.56.0000.0000 (English)
Driver Attributes: Final Retail
WHQL Logo'd: n/a
Date and Size: 5/28/2008 01:10:44, 220672 bytes
Other Files:
Driver Provider: Conexant
HW Accel Level: Basic
Cap Flags: 0x0
Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX? 2.0 Listen/Src: No, No
I3DL2? Listen/Src: No, No
Sensaura? ZoomFX?: No

Description: SPDIF Interface (Conexant High Definition SmartAudio 221)
Default Sound Playback: No
Default Voice Playback: No
Hardware ID: HDAUDIO\FUNC_01&VEN_14F1&DEV_5051&SUBSYS_17AA211C&REV_1000
Manufacturer ID: 1
Product ID: 100
Type: WDM
Driver Name: CHDRT32.sys
Driver Version: 4.56.0000.0000 (English)
Driver Attributes: Final Retail
WHQL Logo'd: n/a
Date and Size: 5/28/2008 01:10:44, 220672 bytes
Other Files:
Driver Provider: Conexant
HW Accel Level: Basic
Cap Flags: 0x0
Min/Max Sample Rate: 0, 0
Static/Strm HW Mix Bufs: 0, 0
Static/Strm HW 3D Bufs: 0, 0
HW Memory: 0
Voice Management: No
EAX? 2.0 Listen/Src: No, No
I3DL2? Listen/Src: No, No
Sensaura? ZoomFX?: No

---------------------
Sound Capture Devices
---------------------
Description: Internal Microphone (Conexant High Definition SmartAudio 221)
Default Sound Capture: Yes
Default Voice Capture: Yes
Driver Name: CHDRT32.sys
Driver Version: 4.56.0000.0000 (English)
Driver Attributes: Final Retail
Date and Size: 5/28/2008 01:10:44, 220672 bytes
Cap Flags: 0x0
Format Flags: 0x0

-------------------
DirectInput Devices
-------------------
Device Name: Mouse
Attached: 1
Controller ID: n/a
Vendor/Product ID: n/a
FF Driver: n/a

Device Name: Keyboard
Attached: 1
Controller ID: n/a
Vendor/Product ID: n/a
FF Driver: n/a

Poll w/ Interrupt: No

I tried several things, but what finally worked was updating all of my codecs to the latest version. If you have any kind of codec pack installed, I'd try doing that. Since then I've had not audio issues (except for the same three songs playing over and over on the radio... but that's another story)

How do I update my codecs?

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