My sound card is not functioning

Hello,
my sound card is not functioning, I went to device manager and my sound card is listed there, I uninstall it already then scan for hardware changes still no sound. but when I check the volume control, it's gray out. I also check the dxdiag thing and went to sound tab it ses "No sound card was found. If one is expected, you should install a sound driver provided by the hardware manufacturer. "
i already repair my windows,reinstall windwows but still nothing happened. no sound though.

i also tried some tips from this site but still didn't work.


please help me. =(


Here mine.

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System Information
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Time of this report: 6/13/2014, 02:09:05
Machine name: markelder2
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp.080413-2111)
Language: English (Regional Setting: English)
System Manufacturer: MSI
System Model: MS-7721
BIOS: BIOS Date: 10/12/13 09:33:51 Ver: 04.06.05
Processor: AMD A4-4000 APU with Radeon(tm) HD Graphics , MMX (2 CPUs), ~3.0GHz
Memory: 1330MB RAM
Page File: 418MB used, 2808MB 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: No sound card was found. If one is expected, you should install a sound driver provided by the hardware manufacturer.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.