Hello, after some investigation i'll found a solution that work for me.
I don't know wich software do this (some antispyware or similar), but my HOST file was modified with this voice
0.0.0.0 spclient.wg.spotify.com
Remove the line, save the HOST file, restart spotify client and/or your desktop.
If you have trouble with managing HOST file, please read this guide.
http://www.thewindowsclub.com/how-to-set-the-windows-7-hosts-file-back-to-default
This solution work for me !!
