I have a Soyo P41865PE and I just installed windows 7 on it. Problem is, I can't find the driver CD and Soyo is out of business so their website doesn't exist anymore. I used EVEREST to find that I have a
Intel 82801EB ICH5 - AC'97 Audio Controller [A-2/A-3] PCI
I have been searching for at least 2 hours and can't find anything. I have installed numerous drivers and nothing works.
If it doesn't work and you can't identif which of the vendors (listed below) is the one that manufactured your AC'97 controller then you'll just have to try to find drivers from all of them (if they don't match they will refuse to install in most cases). Assuming it is 32 bit OS you should have some luck, I've given up on 64-bit OS's on some controllers and reverted the OS.
To be honest with you that kind of thing is supposed to just work in windows 7. Both times I've installed it it came up with sounds before I installed any drivers.
Just make sure that whatever you get at least says it has vista drivers, since you can install those anyway and it should just work to begin with.
Check your device manager to see if the audio thing is even detected at all by windows and has a yellow question mark by it. You could try right clicking that and telling to install a driver and see if it just finds it. If it isn't there then its either broken, disabled or somehow totally not compatible.
In my spare parts build I used an old MSI mobo with the ac'97 chipset. Booted ok but no sound.Generally(99%) those chipsets don't have driver problems, but they can burn out. Put a usb Sound 3D stick in it. Bingo!!