Hey man I went to sony's site and I can't find your model. Are you sure about the model #?
if you need help finding the model #
Sony eSupport - Electronics - Support Information
this is the only driver I could find for a Vaio
ftp://download.sony.com/US/pc/REDAUD-12959400-US.EXE
I don't know if this helps but I hope so it took me about 15 min. of sorting through sony's site to find a link.
hope this helps