No log-on

All of a sudden, my music download program does not react when I click on it, so I downloaded Limewire, same thing , downloaded Kazaa, same thing. All my other programs are working fine, the common denominator is that no music download program seem to log on, I don’t have any pop-up blockers working, I downloaded a lot of music 2 day’s ago, all of a sudden none seem to work. Any ideas?