I too have been facing this same problem lately. I thought it was a virus at first, but after cleaning up my system, re-installing Windows, Defragmenting, running scandisk etc etc...It still won't work. I had it working for about a month, and then it all of a sudden just stopped! All I get is the start screen and nothing, then it stops responding...Why can't other file sharing services just WORK? you know, Like Napster did? :-)