Normally, I'd 100% agree with Sin Chase and PapaLazaru in this situation.
But I've had about 2 or 3 computers that I simply could not find a working driver for. The audio driver on the Dell site just made them blue screen.
First I tried every driver that the manufacturer made, either they didn't work, or had instant blue screens.
Then I downloaded the Driverspacks drivers, extract them, mounted them to cd, and again, blue screen.
The third and final solution was using a program called
SlimDrivers, the one that it downloaded for the soundcard worked perfectly.
I only use this as a last ditch attempt. And I uninstall it right away after using it!
edit
This is what I'd use!
http://drp.su/download.htm
100% free and they use the Driverpacks files
edit2 watch the installer, it's got crapware :/ untick the first one, next. then decline the next