|Sound has nothing to do with your 530TX - that's your network adapter.|
If you double click on it and find no drivers have been installed for it (they're not built into Windows) ....
Get the drivers on another computer, copy them to a floppy disk, install them on your computer.
If the executable file won't fit on the floppy, execute the download on the other computer to expand it's contents, go to where the contents were expanded to, delete the folders with operating system names you don't need for Win 98 or 98SE, and copy the remaining files to the floppy disk
Or if you have the floppy disk that came either the 530TX, install them from that