Rats! Sorry to hear more bad news
1. BEFORE you tried the install, did you first go into Add/Remove programs to uninstall Realtek first???
2. This is the
newest Sis driver from Sis. I also checked and it does match your onboard soundcard ID.
(tho so did the realtek driver you also installed since it installed OK according to your dxdiag report) If i recall when i looked there's a setup.exe file to run in the Sis download zip file
But i'm also not convinced its a simple driver issue

as your last dxdiag / directx showed both Creative and Realtek were installed correctly and even your old Creative still wouldn't work.
It may still provde simplest and cheapest to look at cheap USB sound cards if this is all too painful
That said...
> Have you tried using a different speaker or headset? make sure its not the ext. speakers
> Do you have internal speakers? Are you still hearing beeps? As another thing to try is boot into Knoppix from CD and see if your audio works under a bootable Knoppix vs Windows (to build a Knoppix CD see Step #2 here: See [post=766270]How to recover your folders/files when Windows won’t boot[/post]
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Note you don't need a sound card for Windows to generate beep tones. you can test your internal speakers with
beepex tool. The internal speakers should work with onboard sound