Share 'Itunes errors'

I have had a few encounters with itunes that just really, lets just say annoyed me, Like for example.I would just be tiding up a couple of my folders. move a couple of folders about.So after i have done all that i want to listen to a little music, so i open itunes put a song on. But a error message comes up.Sorry buy the file could not be found. just beacuse i moved the file where the songs wer...