OK Pugh,
go
here and get the latest driver - I'm using Win ME not that that should make any difference really for Winamp.
All the cards are basically the same - it's only the software that varies.
My card is the SBLive "Digital Entertainment" - basically no frills with digital output built in
The file is an "auto-update" type - very easy to install (famous last words - hehe) hopefully it will be the same for you.
Let me know how you get on