Hey dom,
When you downloaded the drivers that Uppy provided, you extracted them to a folder?
When you see "Found New Hardware" wizard appear, select the option
Install from specific location - Next, Tick
Include this location in the search, and click on
Browse. Then select the location of where you extracted the files to, and follow the wizard to the end.
If you really do have problems onboard, and no space for any more cards, you can get USB sound devices such as
USB Virtual 5.1 Channel Sound Adapter with MIC Input USBG-SV5 LOW PRICE $19.98