For some reason, after today's update my microphone doesn't work.  I get the channel beep, but no sound comes out.  I checked the windows setup, tested the mic offline, changed the mic, used wave in, did all the usual stuff up to and including rebooting the computer.  I also selected, tested, and could not use the mic attached to my usb camera, which also works perfectly in windows.
Dxdiag info:
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System Information
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Time of this report: 7/23/2010, 21:20:04
       Machine name: BOB2
   Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.090206-1234)
           Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.                
       System Model: OptiPlex GX620               
               BIOS: Phoenix ROM BIOS PLUS Version 1.10 A03
          Processor: Intel(R) Pentium(R) 4 CPU 3.00GHz (2 CPUs)
             Memory: 3070MB RAM
          Page File: 374MB used, 4059MB available
        Windows Dir: C:\WINDOWS
    DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
     DxDiag Version: 5.03.2600.5512 32bit Unicode
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DxDiag Notes
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  DirectX Files Tab: No problems found.
      Display Tab 1: No problems found.
        Sound Tab 1: DirectSound test results: All tests were successful.
        Sound Tab 2: No problems found.
          Music Tab: No problems found.
          Input Tab: No problems found.
        Network Tab: No problems found.
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DirectX Debug Levels
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Direct3D:    0/4 (n/a)
DirectDraw:  0/4 (retail)
DirectInput: 0/5 (n/a)
DirectMusic: 0/5 (n/a)
DirectPlay:  0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow:  0/6 (retail)
---------------
Display Devices
---------------
        Card name: NVIDIA GeForce 8600 GT
     Manufacturer: NVIDIA
        Chip type: GeForce 8600 GT
         DAC type: Integrated RAMDAC
       Device Key: Enum\PCI\VEN_10DE&DEV_0401&SUBSYS_22861682&REV_A1
   Display Memory: 512.0 MB
     Current Mode: 1024 x 768 (32 bit) (60Hz)
          Monitor: Plug and Play Monitor
  Monitor Max Res: 1600,1200
      Driver Name: nv4_disp.dll
   Driver Version: 6.14.0011.6923 (English)
      DDI Version: 9 (or higher)
Driver Attributes: Final Retail
 Driver Date/Size: 12/7/2007 01:51:00, 5773568 bytes
      WHQL Logo'd: n/a
  WHQL Date Stamp: n/a
              VDD: n/a
         Mini VDD: nv4_mini.sys
    Mini VDD Date: 12/7/2007 01:51:00, 7435648 bytes
Device Identifier: {D7B71E3E-4741-11CF-396E-8D0200C2CB35}
        Vendor ID: 0x10DE
        Device ID: 0x0401
        SubSys ID: 0x22861682
      Revision ID: 0x00A1
      Revision ID: 0x00A1
      Video Accel: ModeMPEG2_C ModeMPEG2_D ModeWMV9_B ModeWMV9_A 
 Deinterlace Caps: {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YUY2,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {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_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(UYVY,YUY2) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {335AA36E-7884-43A4-9C91-7F87FAF3E37E}: Format(In/Out)=(YV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_BOBVerticalSt retch 
                   {6CB69578-7617-4637-91E5-1C02DB810285}: Format(In/Out)=(NV12,0x3231564e) Frames(Prev/Fwd/Back)=(0,0,0) Caps=VideoProcess_YUV2RGB VideoProcess_StretchX VideoProcess_StretchY DeinterlaceTech_PixelAdaptive 
                   {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_BOBVerticalSt retch 
         Registry: OK
     DDraw Status: Enabled
       D3D Status: Enabled
       AGP Status: Enabled
DDraw Test Result: Not run
 D3D7 Test Result: Not run
 D3D8 Test Result: Not run
 D3D9 Test Result: Not run
-------------
Sound Devices
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            Description: SoundMAX Digital Audio
 Default Sound Playback: Yes
 Default Voice Playback: Yes
            Hardware ID: PCI\VEN_8086&DEV_27DE&SUBSYS_01AD1028&REV_01
        Manufacturer ID: 65535
             Product ID: 65535
                   Type: WDM
            Driver Name: smwdm.sys
         Driver Version: 5.12.0001.5246 (English)
      Driver Attributes: Final Retail
            WHQL Logo'd: n/a
          Date and Size: 1/27/2005 22:31:06, 260352 bytes
            Other Files: 
        Driver Provider: Analog Devices
         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(tm) 2.0 Listen/Src: No, No
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: All tests were successful.
            Description: Modem #1 Line Playback (emulated)
 Default Sound Playback: No
 Default Voice Playback: No
            Hardware ID: 
        Manufacturer ID: 1
             Product ID: 81
                   Type: Emulated
            Driver Name: 
         Driver Version: 
      Driver Attributes: 
            WHQL Logo'd: 
          Date and Size: 
            Other Files: 
        Driver Provider: 
         HW Accel Level: Full
              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(tm) 2.0 Listen/Src: No, No
   I3DL2(tm) Listen/Src: No, No
Sensaura(tm) ZoomFX(tm): No
               Registry: OK
      Sound Test Result: Not run
---------------------
Sound Capture Devices
---------------------
            Description: SoundMAX Digital Audio
  Default Sound Capture: Yes
  Default Voice Capture: Yes
            Driver Name: smwdm.sys
         Driver Version: 5.12.0001.5246 (English)
      Driver Attributes: Final Retail
          Date and Size: 1/27/2005 22:31:06, 260352 bytes
              Cap Flags: 0x0
           Format Flags: 0x0
            Description: Modem #1 Line Record (emulated)
  Default Sound Capture: No
  Default Voice Capture: No
            Driver Name: 
         Driver Version: 
      Driver Attributes: 
          Date and Size: 
              Cap Flags: 0x0
           Format Flags: 0x0
            Description: Dynex 1.3MP Webcam
  Default Sound Capture: No
  Default Voice Capture: No
            Driver Name: usbaudio.sys
         Driver Version: 5.01.2600.5512 (English)
      Driver Attributes: Final Retail
          Date and Size: 4/13/2008 14:45:12, 60032 bytes
              Cap Flags: 0x0
           Format Flags: 0x0