Been there done that, had limewire hiccupping restart all over the place until I unpluged my dsl modem (not necessarily necessary, but I figured if the nasties were trying to phone home to add more badstuff -see Wikipdeia for all the tech terms I wasn't going to make it ez), and purged W32.Alcra.B. Should be running peer guardian, and scan any file b4 opening it (though NAV has caught many in mid download).