Internet interferance with Audio!!

For some time now i have been experiencing crackles and distorted sound when listening to mp3's via VLC, have tried allsorts of suggestions to cure this but nothing seems to work.

Have now tracked it down to interfence from the internet, if I close down my router the audio is near perfect, as soon as I switch it back on again I have distorted sound.

Any thoughts please how I can sort this out, thanks