Can't get my microphone to work - getting desperate

Help, please. Can't get my microphone to work.
An error occurred during Directplay Voice setup. The error code is
0x80004005
Windows error message "Windows cannot execute DpvSetup.exe, use Add/Remove
Programs control panel to install"

I have XP prof. and DirectX 9.0c and all up to date drivers
Tried all the remedies suggested and I'm still stuck


XP Pro AMD P3200, 64, 1 Gb, MSI mb
System Model: AWRDACPI
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Athlon(tm) 64 Processor 3200+, MMX, 3DNow,
~2.3GHz
Memory: 1024MB RAM
Page File: 345MB used, 2113MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: /Silent
DxDiag Version: 5.03.2600.2180 32bit UnicodeRoy
Help!



Google search indicates many many others with same problem but i cannot
locate a solution.

Microsoft knowledge base resolution did NOT resolve??!!
Tried this too but no joy!

Tried all the advice below but I still haven't fixed the problem.

"The solution involves reconfiguring some advanced sound settings and
tweaking the Registry. Start by opening the Control Panel and selecting the
Sounds And Audio Devices icon (in the Sounds, Speech, And Audio Devices
category). Choose the Voice tab, locate the Voice Playback heading, and
click the Advanced button. From the Advanced Audio Properties dialog box,
choose its Performance tab and move the Hardware Acceleration slider to the
right. It doesn't matter how far to the right, as long as the Hardware
Acceleration slider is set to something other than None. Click OK to close
the dialog boxes.

Before continuing to the next phase of the solution, you must make sure
Dpvsetup.exe isn't open and running on your PC. Press the CTRL-ALT-DELETE
key combination to access the Task Manager and locate any references to
Dpvsetup.exe or DirectPlay Voice. End all of them and close the Task
Manager.

Now it's time to edit the Registry. Open the Start menu, select Run, type
regedit in the Open field, and click OK. In the Registry Editor, locate and
highlight HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\DIRECTPLAY\VOICE\AUDIOCONFIG.
The AudioConfig key should include a pair of nested folders labeled with
hexadecimal numbers. Open both of them to reveal several Registry values,
including three labeled as FullDuplex, HalfDuplex, and MicDetected.

Right-click the FullDuplex value and select Modify from the pop-up menu. In
the resulting Edit DWORD Value dialog box, type 3 in the Value Data field
and click OK. Repeat the procedure for the HalfDuplex and MicDetected
values, setting the Edit Value fields to 3 for HalfDuplex and 2 for
MicDetected. Close the Registry Editor and reboot the computer. The
microphone should now work correctly. If it doesn't, you may have a
malfunctioning microphone or Game Voice control pad on your hands.