No Audio Output Device Installed

Hello,

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System Information
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Time of this report: 8/15/2010, 16:17:37
Machine name: USER-PC
Operating System: Windows Vista(TM) Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.100608-0458)
Language: English (Regional Setting: English)
System Manufacturer: Acer
System Model: Aspire 5520
BIOS: PhoenixBIOS 4.0 Release 6.1
Processor: AMD Turion(tm) 64 X2 Mobile Technology TL-60 (2 CPUs), ~2.0GHz
Memory: 2814MB RAM
Page File: 1995MB used, 6728MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 10
DX Setup Parameters: Not found
DxDiag Version: 6.00.6001.18000 32bit Unicode
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I am having issues with my sound device, I have seen many similar posts yet none of the fixes recommended there seem to work with my machine.

I have the messege No Audio Output Device Installed and the speaker icon with a red cross. In my device manager I have no Sound Option at all.

I have uninstalled/reinstalled numerous Realtek Drivers but my sound is still not working. The issue arose after my machine automatically installed windows updates, yet after uninstalling them all and reinstalling drivers still nothing. I even rolled back my machine to an early recover point before the issue occured and it is still not working.

I haven't had the back of this laptop off to look at the soundcard so I am assuming that this is a software/driver issue.

Please can you help me resolve this issue.
Thanks in advance.