Multimedia Audio Controller Installation Failure

I just completed a reformat/reinstall on a Dell Dimension 4700 running an OEM version of Windows XP Home Multimedia Edition. I had a few driver issues, but I got them all resolved but one, and that is the Multimedia Audio Controller, which is listed under "other devices" in the Device Manager. When I run the wizard, it says it can't find the driver. I located the device by running msinfo32, and I went to the Dell site and located the driver I need (I think) which is R89530.exe.

I downloaded the driver and it only downloads about 1 Mb of a 7 Mb file. I double clicked to run it anyway, and after going through the standard process of creating a folder for it, this message popped up: "This self-extracting zip file is part of a multidisk zip file. Please insert the last disk of the set." Then when I cancel out of the download, it gives me the message, "An error occurred while unzipping. One or more files were not successfully unzipped. The error code is 190."

I have downloaded the file from Dell USA, Dell Canada, and Dell Europe, as well as from an ftp site I found on Google, which is a list of Dell compatible drivers, and the same thing happens with each download. Have you ever seen this before, and if so, do you know of any solution? I currently have no sound, except for the pathetic little beep the system occasionally makes -- nothing at all out of the speakers.