My phone has been working fine, up till last night. All of a sudden when I plug it into USB I get an error that there was a device malfunction. In dev man there's a Microsoft WPD FileSystem Volume that windows says cannot start properly, and a unknown device under USB. I've system restored, I've power drained, I've tried on 3 pc's. Same thing. All pc's are running windows 7 64 bit. Any ideas?