WIndows 98/95 in Dosbox sound and hardware problem?

I recently watched tutorials on how to install windows img file on dosbox. but there is problem. When i try opening some sound file it says me to install drivers from control panel, but when i try installing it, windows doesnt find the driver... is that because my img file is incomplete or something else? i downloaded the file from http://jbsmith20.net/PCApp/
pls help
regards