Welcome to windrivers mlb51981. More info please:
- Exact model # for your vaio
- 98 or 98se?

In either case, your vaio should have come w/ a set of cd's. One of these should contain all the drivers. Depending on the specific model of your sound card, there is either an installation program to be run (most likely) or you can point the hardware wizard to the directory on the cd containing your sound card driver.