converting zip format to mp3 format

A zip file isn't a music format, it's simply a compressed file to save space.

See this for how unzip it.

http://itsvista.com/2007/01/itsvista-tip-16-using-vista-to-zip-and-unzip-files-a nd-folders/

if it is a zip, than it is likely in a folder correct? if you open that folder, than right click & copy/cut each song file, than paste them into the appropriate music folder, than import into itunes, you should be good. i've never seen a zip music file, just a zip folder than contains the music. hope that helps...