The support page with the audio driver update seen first is at
http://www.gigabyte.com.tw/Support/M...ProductID=2741
Just below the orange divider bar on the page there simply click where it says download link. The update will most likely have it's own installer or will at least unpack the files to a folder you designate.
Give those a try once you have removed the cd version to see if those go on better.