Onboard Audio. Last resort. PLEASE help.

Hello there. I've tried many places, no one has been able to help me, so i've come here.
This is the final time i'm going to muck around with my computers drivers, because i'm getting so annoyed.
I've reformatted my computer like, 4 times in 2 days now.
It's mainly surrounding my sound. but if you guys can help with other things, it will be great. I have Onboard sound.

My motherboard is ASUS P4S800-MX
My Chipset is a SiS 661FX
I have an Intel Celeron 2.67 ghz
Windows XP Home Edition, Service Pack 2.
I went into my Bios, and it said 'Realtek AC97 [Auto]'. It could either be 'Disabled, or Auto'.
I remember a while ago i had an audio program called 'SoundMax', but i got that from my Asus motherboard disc. But i don't have that anymore, and last time i reformated, the SoundMax drivers didn't work, And the Realtek AC97 drivers kept restarting my computer each time i would try and install.
In 'Device Manager' My sound driver has a yellow question mark over it, and it seemed nothing would work for me last time. Each time i try to install Realtek Audio Drivers, my computer just restarts, it's really annoying, even in safe mode.
Could someone please, if possible do a step by step instruction on what drivers i install first etc, if you do, you will seriously be my hero. no joke.

I rememeber i tried to download and install this driver.
http://www.majorgeeks.com/Realtek_AC...ers_d4400.html
for my audio, but each time i tried to, it would get to the end, and just restart my computer. I even tried in safe mode, no luck.
I tried to install PCI SiS Audio drivers, but it just gave me an error message. Now, i have just done a fresh install of Xp Home Edition, NO drivers installed.

Edit: I remember trying to install the Asus Audio drivers from the site, they were called Soundmax, but when i clicked the 'install.exe' nothing opened or anything and under the name 'install.exe' in faint grey, it said 'Installer for windows 2000' but i'm SURE i downloaded the driver for Windows XP.

Thank you so much.


Edit again : This is the official info from Belarc.

Board: ASUSTeK Computer INC. P4S800MX REV 1.xx
Bus Clock: 133 megahertz
BIOS: Award Software, Inc. ASUS P4S800MX ACPI BIOS Revision 1008 04/30/2004

2.67 gigahertz Intel Celeron
16 kilobyte primary memory cache
256 kilobyte secondary memory cache

80.02 Gigabytes Usable Hard Drive Capacity
76.48 Gigabytes Hard Drive Free Space

HL-DT-ST DVDRAM GSA-4163B [CD-ROM drive]
LITE-ON CD-RW SOHR-5238S [CD-ROM drive]
3.5" format removeable media [Floppy drive]

WDC WD800JB-00FSA0 [Hard drive] (80.03 GB) -- drive 0, s/n WD-WCAJD1882334, rev 77.07W77, SMART Status: Healthy

Other Devices
OHCI Compliant IEEE 1394 Host Controller
Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
PS/2 Compatible Mouse
USB Root Hub (3x)