i recently bought the program limewire and i was wondering if there were any virus threats that this program brings to my computer. the first two times i used limewire it was running for 10 minutes and then my computer shut down. it hasnt happened again but i am limiting my time to limewire for the moment. also, each time my computer started, a file came up right away named "ISTsvc". i tried to delete it but my computer wouldnt let me. what do i do?? i dont want to mess up my computer, please tell me if i am!