Finally - XP Sound Card Driver for Dell XPS 430
Finally thanks to driverpacks.net forum I have found sound card driver for my Dell XPS 430.
Sadly but Dell has built driver for this card to works only on Windows Vista and on IDT site it’s impossible to download drivers because they have such agreement with OEMs that they cannot provide drivers by themselves.
Pukkita has modified one of the IDT sound card drivers for Gateway and it works on my Dell.
Link for download you can find on Pukkita’s blog as well as Paypal Donations link.